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/**
 * WordPress Post Template Functions.
 *
 * Gets content for the current post in the loop.
 *
 * @package WordPress
 * @subpackage Template
 */

/**
 * Displays the ID of the current item in the WordPress Loop.
 *
 * @since 0.71
 */
function the_ID() { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
	echo get_the_ID();
}

/**
 * Retrieves the ID of the current item in the WordPress Loop.
 *
 * @since 2.1.0
 *
 * @return int|false The ID of the current item in the WordPress Loop. False if $post is not set.
 */
function get_the_ID() { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
	$post = get_post();
	return ! empty( $post ) ? $post-&gt;ID : false;
}

/**
 * Displays or retrieves the current post title with optional markup.
 *
 * @since 0.71
 *
 * @param string $before  Optional. Markup to prepend to the title. Default empty.
 * @param string $after   Optional. Markup to append to the title. Default empty.
 * @param bool   $display Optional. Whether to echo or return the title. Default true for echo.
 * @return void|string Void if `$display` argument is true or the title is empty,
 *                     current post title if `$display` is false.
 */
function the_title( $before = &#039;&#039;, $after = &#039;&#039;, $display = true ) {
	$title = get_the_title();

	if ( strlen( $title ) === 0 ) {
		return;
	}

	$title = $before . $title . $after;

	if ( $display ) {
		echo $title;
	} else {
		return $title;
	}
}

/**
 * Sanitizes the current title when retrieving or displaying.
 *
 * Works like the_title(), except the parameters can be in a string or
 * an array. See the function for what can be override in the $args parameter.
 *
 * The title before it is displayed will have the tags stripped and esc_attr()
 * before it is passed to the user or displayed. The default as with the_title(),
 * is to display the title.
 *
 * @since 2.3.0
 *
 * @param string|array $args {
 *     Title attribute arguments. Optional.
 *
 *     @type string  $before Markup to prepend to the title. Default empty.
 *     @type string  $after  Markup to append to the title. Default empty.
 *     @type bool    $echo   Whether to echo or return the title. Default true for echo.
 *     @type WP_Post $post   Current post object to retrieve the title for.
 * }
 * @return void|string Void if &#039;echo&#039; argument is true, the title attribute if &#039;echo&#039; is false.
 */
function the_title_attribute( $args = &#039;&#039; ) {
	$defaults    = array(
		&#039;before&#039; =&gt; &#039;&#039;,
		&#039;after&#039;  =&gt; &#039;&#039;,
		&#039;echo&#039;   =&gt; true,
		&#039;post&#039;   =&gt; get_post(),
	);
	$parsed_args = wp_parse_args( $args, $defaults );

	$title = get_the_title( $parsed_args[&#039;post&#039;] );

	if ( strlen( $title ) === 0 ) {
		return;
	}

	$title = $parsed_args[&#039;before&#039;] . $title . $parsed_args[&#039;after&#039;];
	$title = esc_attr( strip_tags( $title ) );

	if ( $parsed_args[&#039;echo&#039;] ) {
		echo $title;
	} else {
		return $title;
	}
}

/**
 * Retrieves the post title.
 *
 * If the post is protected and the visitor is not an admin, then &quot;Protected&quot;
 * will be inserted before the post title. If the post is private, then
 * &quot;Private&quot; will be inserted before the post title.
 *
 * @since 0.71
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return string
 */
function get_the_title( $post = 0 ) {
	$post = get_post( $post );

	$post_title = isset( $post-&gt;post_title ) ? $post-&gt;post_title : &#039;&#039;;
	$post_id    = isset( $post-&gt;ID ) ? $post-&gt;ID : 0;

	if ( ! is_admin() ) {
		if ( ! empty( $post-&gt;post_password ) ) {

			/* translators: %s: Protected post title. */
			$prepend = __( &#039;Protected: %s&#039; );

			/**
			 * Filters the text prepended to the post title for protected posts.
			 *
			 * The filter is only applied on the front end.
			 *
			 * @since 2.8.0
			 *
			 * @param string  $prepend Text displayed before the post title.
			 *                         Default &#039;Protected: %s&#039;.
			 * @param WP_Post $post    Current post object.
			 */
			$protected_title_format = apply_filters( &#039;protected_title_format&#039;, $prepend, $post );

			$post_title = sprintf( $protected_title_format, $post_title );
		} elseif ( isset( $post-&gt;post_status ) &amp;&amp; &#039;private&#039; === $post-&gt;post_status ) {

			/* translators: %s: Private post title. */
			$prepend = __( &#039;Private: %s&#039; );

			/**
			 * Filters the text prepended to the post title of private posts.
			 *
			 * The filter is only applied on the front end.
			 *
			 * @since 2.8.0
			 *
			 * @param string  $prepend Text displayed before the post title.
			 *                         Default &#039;Private: %s&#039;.
			 * @param WP_Post $post    Current post object.
			 */
			$private_title_format = apply_filters( &#039;private_title_format&#039;, $prepend, $post );

			$post_title = sprintf( $private_title_format, $post_title );
		}
	}

	/**
	 * Filters the post title.
	 *
	 * @since 0.71
	 *
	 * @param string $post_title The post title.
	 * @param int    $post_id    The post ID.
	 */
	return apply_filters( &#039;the_title&#039;, $post_title, $post_id );
}

/**
 * Displays the Post Global Unique Identifier (guid).
 *
 * The guid will appear to be a link, but should not be used as a link to the
 * post. The reason you should not use it as a link, is because of moving the
 * blog across domains.
 *
 * URL is escaped to make it XML-safe.
 *
 * @since 1.5.0
 *
 * @param int|WP_Post $post Optional. Post ID or post object. Default is global $post.
 */
function the_guid( $post = 0 ) {
	$post = get_post( $post );

	$post_guid = isset( $post-&gt;guid ) ? get_the_guid( $post ) : &#039;&#039;;
	$post_id   = isset( $post-&gt;ID ) ? $post-&gt;ID : 0;

	/**
	 * Filters the escaped Global Unique Identifier (guid) of the post.
	 *
	 * @since 4.2.0
	 *
	 * @see get_the_guid()
	 *
	 * @param string $post_guid Escaped Global Unique Identifier (guid) of the post.
	 * @param int    $post_id   The post ID.
	 */
	echo apply_filters( &#039;the_guid&#039;, $post_guid, $post_id );
}

/**
 * Retrieves the Post Global Unique Identifier (guid).
 *
 * The guid will appear to be a link, but should not be used as an link to the
 * post. The reason you should not use it as a link, is because of moving the
 * blog across domains.
 *
 * @since 1.5.0
 *
 * @param int|WP_Post $post Optional. Post ID or post object. Default is global $post.
 * @return string
 */
function get_the_guid( $post = 0 ) {
	$post = get_post( $post );

	$post_guid = isset( $post-&gt;guid ) ? $post-&gt;guid : &#039;&#039;;
	$post_id   = isset( $post-&gt;ID ) ? $post-&gt;ID : 0;

	/**
	 * Filters the Global Unique Identifier (guid) of the post.
	 *
	 * @since 1.5.0
	 *
	 * @param string $post_guid Global Unique Identifier (guid) of the post.
	 * @param int    $post_id   The post ID.
	 */
	return apply_filters( &#039;get_the_guid&#039;, $post_guid, $post_id );
}

/**
 * Displays the post content.
 *
 * @since 0.71
 *
 * @param string $more_link_text Optional. Content for when there is more text.
 * @param bool   $strip_teaser   Optional. Strip teaser content before the more text. Default false.
 */
function the_content( $more_link_text = null, $strip_teaser = false ) {
	$content = get_the_content( $more_link_text, $strip_teaser );

	/**
	 * Filters the post content.
	 *
	 * @since 0.71
	 *
	 * @param string $content Content of the current post.
	 */
	$content = apply_filters( &#039;the_content&#039;, $content );
	$content = str_replace( &#039;]]&gt;&#039;, &#039;]]&amp;gt;&#039;, $content );
	echo $content;
}

/**
 * Retrieves the post content.
 *
 * @since 0.71
 * @since 5.2.0 Added the `$post` parameter.
 *
 * @global int   $page      Page number of a single post/page.
 * @global int   $more      Boolean indicator for whether single post/page is being viewed.
 * @global bool  $preview   Whether post/page is in preview mode.
 * @global array $pages     Array of all pages in post/page. Each array element contains
 *                          part of the content separated by the `&lt;!--nextpage--&gt;` tag.
 * @global int   $multipage Boolean indicator for whether multiple pages are in play.
 *
 * @param string             $more_link_text Optional. Content for when there is more text.
 * @param bool               $strip_teaser   Optional. Strip teaser content before the more text. Default false.
 * @param WP_Post|object|int $post           Optional. WP_Post instance or Post ID/object. Default null.
 * @return string
 */
function get_the_content( $more_link_text = null, $strip_teaser = false, $post = null ) {
	global $page, $more, $preview, $pages, $multipage;

	$_post = get_post( $post );

	if ( ! ( $_post instanceof WP_Post ) ) {
		return &#039;&#039;;
	}

	/*
	 * Use the globals if the $post parameter was not specified,
	 * but only after they have been set up in setup_postdata().
	 */
	if ( null === $post &amp;&amp; did_action( &#039;the_post&#039; ) ) {
		$elements = compact( &#039;page&#039;, &#039;more&#039;, &#039;preview&#039;, &#039;pages&#039;, &#039;multipage&#039; );
	} else {
		$elements = generate_postdata( $_post );
	}

	if ( null === $more_link_text ) {
		$more_link_text = sprintf(
			&#039;&lt;span aria-label=&quot;%1$s&quot;&gt;%2$s&lt;/span&gt;&#039;,
			sprintf(
				/* translators: %s: Post title. */
				__( &#039;Continue reading %s&#039; ),
				the_title_attribute(
					array(
						&#039;echo&#039; =&gt; false,
						&#039;post&#039; =&gt; $_post,
					)
				)
			),
			__( &#039;(more&amp;hellip;)&#039; )
		);
	}

	$output     = &#039;&#039;;
	$has_teaser = false;

	// If post password required and it doesn&#039;t match the cookie.
	if ( post_password_required( $_post ) ) {
		return get_the_password_form( $_post );
	}

	// If the requested page doesn&#039;t exist.
	if ( $elements[&#039;page&#039;] &gt; count( $elements[&#039;pages&#039;] ) ) {
		// Give them the highest numbered page that DOES exist.
		$elements[&#039;page&#039;] = count( $elements[&#039;pages&#039;] );
	}

	$page_no = $elements[&#039;page&#039;];
	$content = $elements[&#039;pages&#039;][ $page_no - 1 ];
	if ( preg_match( &#039;/&lt;!--more(.*?)?--&gt;/&#039;, $content, $matches ) ) {
		if ( has_block( &#039;more&#039;, $content ) ) {
			// Remove the core/more block delimiters. They will be left over after $content is split up.
			$content = preg_replace( &#039;/&lt;!-- \/?wp:more(.*?) --&gt;/&#039;, &#039;&#039;, $content );
		}

		$content = explode( $matches[0], $content, 2 );

		if ( ! empty( $matches[1] ) &amp;&amp; ! empty( $more_link_text ) ) {
			$more_link_text = strip_tags( wp_kses_no_null( trim( $matches[1] ) ) );
		}

		$has_teaser = true;
	} else {
		$content = array( $content );
	}

	if ( str_contains( $_post-&gt;post_content, &#039;&lt;!--noteaser--&gt;&#039; )
		&amp;&amp; ( ! $elements[&#039;multipage&#039;] || 1 === $elements[&#039;page&#039;] )
	) {
		$strip_teaser = true;
	}

	$teaser = $content[0];

	if ( $elements[&#039;more&#039;] &amp;&amp; $strip_teaser &amp;&amp; $has_teaser ) {
		$teaser = &#039;&#039;;
	}

	$output .= $teaser;

	if ( count( $content ) &gt; 1 ) {
		if ( $elements[&#039;more&#039;] ) {
			$output .= &#039;&lt;span id=&quot;more-&#039; . $_post-&gt;ID . &#039;&quot;&gt;&lt;/span&gt;&#039; . $content[1];
		} else {
			if ( ! empty( $more_link_text ) ) {

				/**
				 * Filters the Read More link text.
				 *
				 * @since 2.8.0
				 *
				 * @param string $more_link_element Read More link element.
				 * @param string $more_link_text    Read More text.
				 */
				$output .= apply_filters( &#039;the_content_more_link&#039;, &#039; &lt;a href=&quot;&#039; . get_permalink( $_post ) . &quot;#more-{$_post-&gt;ID}\&quot; class=\&quot;more-link\&quot;&gt;$more_link_text&lt;/a&gt;&quot;, $more_link_text );
			}
			$output = force_balance_tags( $output );
		}
	}

	return $output;
}

/**
 * Displays the post excerpt.
 *
 * @since 0.71
 */
function the_excerpt() {

	/**
	 * Filters the displayed post excerpt.
	 *
	 * @since 0.71
	 *
	 * @see get_the_excerpt()
	 *
	 * @param string $post_excerpt The post excerpt.
	 */
	echo apply_filters( &#039;the_excerpt&#039;, get_the_excerpt() );
}

/**
 * Retrieves the post excerpt.
 *
 * @since 0.71
 * @since 4.5.0 Introduced the `$post` parameter.
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return string Post excerpt.
 */
function get_the_excerpt( $post = null ) {
	if ( is_bool( $post ) ) {
		_deprecated_argument( __FUNCTION__, &#039;2.3.0&#039; );
	}

	$post = get_post( $post );
	if ( empty( $post ) ) {
		return &#039;&#039;;
	}

	if ( post_password_required( $post ) ) {
		return __( &#039;There is no excerpt because this is a protected post.&#039; );
	}

	/**
	 * Filters the retrieved post excerpt.
	 *
	 * @since 1.2.0
	 * @since 4.5.0 Introduced the `$post` parameter.
	 *
	 * @param string  $post_excerpt The post excerpt.
	 * @param WP_Post $post         Post object.
	 */
	return apply_filters( &#039;get_the_excerpt&#039;, $post-&gt;post_excerpt, $post );
}

/**
 * Determines whether the post has a custom excerpt.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.3.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return bool True if the post has a custom excerpt, false otherwise.
 */
function has_excerpt( $post = 0 ) {
	$post = get_post( $post );
	return ( ! empty( $post-&gt;post_excerpt ) );
}

/**
 * Displays the classes for the post container element.
 *
 * @since 2.7.0
 *
 * @param string|string[] $css_class Optional. One or more classes to add to the class list.
 *                                   Default empty.
 * @param int|WP_Post     $post      Optional. Post ID or post object. Defaults to the global `$post`.
 */
function post_class( $css_class = &#039;&#039;, $post = null ) {
	// Separates classes with a single space, collates classes for post DIV.
	echo &#039;class=&quot;&#039; . esc_attr( implode( &#039; &#039;, get_post_class( $css_class, $post ) ) ) . &#039;&quot;&#039;;
}

/**
 * Retrieves an array of the class names for the post container element.
 *
 * The class names are many:
 *
 *  - If the post has a post thumbnail, `has-post-thumbnail` is added as a class.
 *  - If the post is sticky, then the `sticky` class name is added.
 *  - The class `hentry` is always added to each post.
 *  - For each taxonomy that the post belongs to, a class will be added of the format
 *    `{$taxonomy}-{$slug}`, e.g. `category-foo` or `my_custom_taxonomy-bar`.
 *    The `post_tag` taxonomy is a special case; the class has the `tag-` prefix
 *    instead of `post_tag-`.
 *
 * All class names are passed through the filter, {@see &#039;post_class&#039;}, followed by
 * `$css_class` parameter value, with the post ID as the last parameter.
 *
 * @since 2.7.0
 * @since 4.2.0 Custom taxonomy class names were added.
 *
 * @param string|string[] $css_class Optional. Space-separated string or array of class names
 *                                   to add to the class list. Default empty.
 * @param int|WP_Post     $post      Optional. Post ID or post object.
 * @return string[] Array of class names.
 */
function get_post_class( $css_class = &#039;&#039;, $post = null ) {
	$post = get_post( $post );

	$classes = array();

	if ( $css_class ) {
		if ( ! is_array( $css_class ) ) {
			$css_class = preg_split( &#039;#\s+#&#039;, $css_class );
		}
		$classes = array_map( &#039;esc_attr&#039;, $css_class );
	} else {
		// Ensure that we always coerce class to being an array.
		$css_class = array();
	}

	if ( ! $post ) {
		return $classes;
	}

	$classes[] = &#039;post-&#039; . $post-&gt;ID;
	if ( ! is_admin() ) {
		$classes[] = $post-&gt;post_type;
	}
	$classes[] = &#039;type-&#039; . $post-&gt;post_type;
	$classes[] = &#039;status-&#039; . $post-&gt;post_status;

	// Post Format.
	if ( post_type_supports( $post-&gt;post_type, &#039;post-formats&#039; ) ) {
		$post_format = get_post_format( $post-&gt;ID );

		if ( $post_format &amp;&amp; ! is_wp_error( $post_format ) ) {
			$classes[] = &#039;format-&#039; . sanitize_html_class( $post_format );
		} else {
			$classes[] = &#039;format-standard&#039;;
		}
	}

	$post_password_required = post_password_required( $post-&gt;ID );

	// Post requires password.
	if ( $post_password_required ) {
		$classes[] = &#039;post-password-required&#039;;
	} elseif ( ! empty( $post-&gt;post_password ) ) {
		$classes[] = &#039;post-password-protected&#039;;
	}

	// Post thumbnails.
	if ( current_theme_supports( &#039;post-thumbnails&#039; ) &amp;&amp; has_post_thumbnail( $post-&gt;ID ) &amp;&amp; ! is_attachment( $post ) &amp;&amp; ! $post_password_required ) {
		$classes[] = &#039;has-post-thumbnail&#039;;
	}

	// Sticky for Sticky Posts.
	if ( is_sticky( $post-&gt;ID ) ) {
		if ( is_home() &amp;&amp; ! is_paged() ) {
			$classes[] = &#039;sticky&#039;;
		} elseif ( is_admin() ) {
			$classes[] = &#039;status-sticky&#039;;
		}
	}

	// hentry for hAtom compliance.
	$classes[] = &#039;hentry&#039;;

	// All public taxonomies.
	$taxonomies = get_taxonomies( array( &#039;public&#039; =&gt; true ) );

	/**
	 * Filters the taxonomies to generate classes for each individual term.
	 *
	 * Default is all public taxonomies registered to the post type.
	 *
	 * @since 6.1.0
	 *
	 * @param string[] $taxonomies List of all taxonomy names to generate classes for.
	 * @param int      $post_id    The post ID.
	 * @param string[] $classes    An array of post class names.
	 * @param string[] $css_class  An array of additional class names added to the post.
	*/
	$taxonomies = apply_filters( &#039;post_class_taxonomies&#039;, $taxonomies, $post-&gt;ID, $classes, $css_class );

	foreach ( (array) $taxonomies as $taxonomy ) {
		if ( is_object_in_taxonomy( $post-&gt;post_type, $taxonomy ) ) {
			foreach ( (array) get_the_terms( $post-&gt;ID, $taxonomy ) as $term ) {
				if ( empty( $term-&gt;slug ) ) {
					continue;
				}

				$term_class = sanitize_html_class( $term-&gt;slug, $term-&gt;term_id );
				if ( is_numeric( $term_class ) || ! trim( $term_class, &#039;-&#039; ) ) {
					$term_class = $term-&gt;term_id;
				}

				// &#039;post_tag&#039; uses the &#039;tag&#039; prefix for backward compatibility.
				if ( &#039;post_tag&#039; === $taxonomy ) {
					$classes[] = &#039;tag-&#039; . $term_class;
				} else {
					$classes[] = sanitize_html_class( $taxonomy . &#039;-&#039; . $term_class, $taxonomy . &#039;-&#039; . $term-&gt;term_id );
				}
			}
		}
	}

	$classes = array_map( &#039;esc_attr&#039;, $classes );

	/**
	 * Filters the list of CSS class names for the current post.
	 *
	 * @since 2.7.0
	 *
	 * @param string[] $classes   An array of post class names.
	 * @param string[] $css_class An array of additional class names added to the post.
	 * @param int      $post_id   The post ID.
	 */
	$classes = apply_filters( &#039;post_class&#039;, $classes, $css_class, $post-&gt;ID );

	return array_unique( $classes );
}

/**
 * Displays the class names for the body element.
 *
 * @since 2.8.0
 *
 * @param string|string[] $css_class Optional. Space-separated string or array of class names
 *                                   to add to the class list. Default empty.
 */
function body_class( $css_class = &#039;&#039; ) {
	// Separates class names with a single space, collates class names for body element.
	echo &#039;class=&quot;&#039; . esc_attr( implode( &#039; &#039;, get_body_class( $css_class ) ) ) . &#039;&quot;&#039;;
}

/**
 * Retrieves an array of the class names for the body element.
 *
 * @since 2.8.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param string|string[] $css_class Optional. Space-separated string or array of class names
 *                                   to add to the class list. Default empty.
 * @return string[] Array of class names.
 */
function get_body_class( $css_class = &#039;&#039; ) {
	global $wp_query;

	$classes = array();

	if ( is_rtl() ) {
		$classes[] = &#039;rtl&#039;;
	}

	if ( is_front_page() ) {
		$classes[] = &#039;home&#039;;
	}
	if ( is_home() ) {
		$classes[] = &#039;blog&#039;;
	}
	if ( is_privacy_policy() ) {
		$classes[] = &#039;privacy-policy&#039;;
	}
	if ( is_archive() ) {
		$classes[] = &#039;archive&#039;;
	}
	if ( is_date() ) {
		$classes[] = &#039;date&#039;;
	}
	if ( is_search() ) {
		$classes[] = &#039;search&#039;;
		$classes[] = $wp_query-&gt;posts ? &#039;search-results&#039; : &#039;search-no-results&#039;;
	}
	if ( is_paged() ) {
		$classes[] = &#039;paged&#039;;
	}
	if ( is_attachment() ) {
		$classes[] = &#039;attachment&#039;;
	}
	if ( is_404() ) {
		$classes[] = &#039;error404&#039;;
	}

	if ( is_singular() ) {
		$post      = $wp_query-&gt;get_queried_object();
		$post_id   = $post-&gt;ID;
		$post_type = $post-&gt;post_type;

		if ( is_page_template() ) {
			$classes[] = &quot;{$post_type}-template&quot;;

			$template_slug  = get_page_template_slug( $post_id );
			$template_parts = explode( &#039;/&#039;, $template_slug );

			foreach ( $template_parts as $part ) {
				$classes[] = &quot;{$post_type}-template-&quot; . sanitize_html_class( str_replace( array( &#039;.&#039;, &#039;/&#039; ), &#039;-&#039;, basename( $part, &#039;.php&#039; ) ) );
			}
			$classes[] = &quot;{$post_type}-template-&quot; . sanitize_html_class( str_replace( &#039;.&#039;, &#039;-&#039;, $template_slug ) );
		} else {
			$classes[] = &quot;{$post_type}-template-default&quot;;
		}

		if ( is_single() ) {
			$classes[] = &#039;single&#039;;
			if ( isset( $post-&gt;post_type ) ) {
				$classes[] = &#039;single-&#039; . sanitize_html_class( $post-&gt;post_type, $post_id );
				$classes[] = &#039;postid-&#039; . $post_id;

				// Post Format.
				if ( post_type_supports( $post-&gt;post_type, &#039;post-formats&#039; ) ) {
					$post_format = get_post_format( $post-&gt;ID );

					if ( $post_format &amp;&amp; ! is_wp_error( $post_format ) ) {
						$classes[] = &#039;single-format-&#039; . sanitize_html_class( $post_format );
					} else {
						$classes[] = &#039;single-format-standard&#039;;
					}
				}
			}
		}

		if ( is_attachment() ) {
			$mime_type   = get_post_mime_type( $post_id );
			$mime_prefix = array( &#039;application/&#039;, &#039;image/&#039;, &#039;text/&#039;, &#039;audio/&#039;, &#039;video/&#039;, &#039;music/&#039; );
			$classes[]   = &#039;attachmentid-&#039; . $post_id;
			$classes[]   = &#039;attachment-&#039; . str_replace( $mime_prefix, &#039;&#039;, $mime_type );
		} elseif ( is_page() ) {
			$classes[] = &#039;page&#039;;
			$classes[] = &#039;page-id-&#039; . $post_id;

			if ( get_pages(
				array(
					&#039;parent&#039; =&gt; $post_id,
					&#039;number&#039; =&gt; 1,
				)
			) ) {
				$classes[] = &#039;page-parent&#039;;
			}

			if ( $post-&gt;post_parent ) {
				$classes[] = &#039;page-child&#039;;
				$classes[] = &#039;parent-pageid-&#039; . $post-&gt;post_parent;
			}
		}
	} elseif ( is_archive() ) {
		if ( is_post_type_archive() ) {
			$classes[] = &#039;post-type-archive&#039;;
			$post_type = get_query_var( &#039;post_type&#039; );
			if ( is_array( $post_type ) ) {
				$post_type = reset( $post_type );
			}
			$classes[] = &#039;post-type-archive-&#039; . sanitize_html_class( $post_type );
		} elseif ( is_author() ) {
			$author    = $wp_query-&gt;get_queried_object();
			$classes[] = &#039;author&#039;;
			if ( isset( $author-&gt;user_nicename ) ) {
				$classes[] = &#039;author-&#039; . sanitize_html_class( $author-&gt;user_nicename, $author-&gt;ID );
				$classes[] = &#039;author-&#039; . $author-&gt;ID;
			}
		} elseif ( is_category() ) {
			$cat       = $wp_query-&gt;get_queried_object();
			$classes[] = &#039;category&#039;;
			if ( isset( $cat-&gt;term_id ) ) {
				$cat_class = sanitize_html_class( $cat-&gt;slug, $cat-&gt;term_id );
				if ( is_numeric( $cat_class ) || ! trim( $cat_class, &#039;-&#039; ) ) {
					$cat_class = $cat-&gt;term_id;
				}

				$classes[] = &#039;category-&#039; . $cat_class;
				$classes[] = &#039;category-&#039; . $cat-&gt;term_id;
			}
		} elseif ( is_tag() ) {
			$tag       = $wp_query-&gt;get_queried_object();
			$classes[] = &#039;tag&#039;;
			if ( isset( $tag-&gt;term_id ) ) {
				$tag_class = sanitize_html_class( $tag-&gt;slug, $tag-&gt;term_id );
				if ( is_numeric( $tag_class ) || ! trim( $tag_class, &#039;-&#039; ) ) {
					$tag_class = $tag-&gt;term_id;
				}

				$classes[] = &#039;tag-&#039; . $tag_class;
				$classes[] = &#039;tag-&#039; . $tag-&gt;term_id;
			}
		} elseif ( is_tax() ) {
			$term = $wp_query-&gt;get_queried_object();
			if ( isset( $term-&gt;term_id ) ) {
				$term_class = sanitize_html_class( $term-&gt;slug, $term-&gt;term_id );
				if ( is_numeric( $term_class ) || ! trim( $term_class, &#039;-&#039; ) ) {
					$term_class = $term-&gt;term_id;
				}

				$classes[] = &#039;tax-&#039; . sanitize_html_class( $term-&gt;taxonomy );
				$classes[] = &#039;term-&#039; . $term_class;
				$classes[] = &#039;term-&#039; . $term-&gt;term_id;
			}
		}
	}

	if ( is_user_logged_in() ) {
		$classes[] = &#039;logged-in&#039;;
	}

	if ( is_admin_bar_showing() ) {
		$classes[] = &#039;admin-bar&#039;;
		$classes[] = &#039;no-customize-support&#039;;
	}

	if ( current_theme_supports( &#039;custom-background&#039; )
		&amp;&amp; ( get_background_color() !== get_theme_support( &#039;custom-background&#039;, &#039;default-color&#039; ) || get_background_image() ) ) {
		$classes[] = &#039;custom-background&#039;;
	}

	if ( has_custom_logo() ) {
		$classes[] = &#039;wp-custom-logo&#039;;
	}

	if ( current_theme_supports( &#039;responsive-embeds&#039; ) ) {
		$classes[] = &#039;wp-embed-responsive&#039;;
	}

	$page = $wp_query-&gt;get( &#039;page&#039; );

	if ( ! $page || $page &lt; 2 ) {
		$page = $wp_query-&gt;get( &#039;paged&#039; );
	}

	if ( $page &amp;&amp; $page &gt; 1 &amp;&amp; ! is_404() ) {
		$classes[] = &#039;paged-&#039; . $page;

		if ( is_single() ) {
			$classes[] = &#039;single-paged-&#039; . $page;
		} elseif ( is_page() ) {
			$classes[] = &#039;page-paged-&#039; . $page;
		} elseif ( is_category() ) {
			$classes[] = &#039;category-paged-&#039; . $page;
		} elseif ( is_tag() ) {
			$classes[] = &#039;tag-paged-&#039; . $page;
		} elseif ( is_date() ) {
			$classes[] = &#039;date-paged-&#039; . $page;
		} elseif ( is_author() ) {
			$classes[] = &#039;author-paged-&#039; . $page;
		} elseif ( is_search() ) {
			$classes[] = &#039;search-paged-&#039; . $page;
		} elseif ( is_post_type_archive() ) {
			$classes[] = &#039;post-type-paged-&#039; . $page;
		}
	}

	if ( ! empty( $css_class ) ) {
		if ( ! is_array( $css_class ) ) {
			$css_class = preg_split( &#039;#\s+#&#039;, $css_class );
		}
		$classes = array_merge( $classes, $css_class );
	} else {
		// Ensure that we always coerce class to being an array.
		$css_class = array();
	}

	$classes = array_map( &#039;esc_attr&#039;, $classes );

	/**
	 * Filters the list of CSS body class names for the current post or page.
	 *
	 * @since 2.8.0
	 *
	 * @param string[] $classes   An array of body class names.
	 * @param string[] $css_class An array of additional class names added to the body.
	 */
	$classes = apply_filters( &#039;body_class&#039;, $classes, $css_class );

	return array_unique( $classes );
}

/**
 * Determines whether the post requires password and whether a correct password has been provided.
 *
 * @since 2.7.0
 *
 * @param int|WP_Post|null $post An optional post. Global $post used if not provided.
 * @return bool false if a password is not required or the correct password cookie is present, true otherwise.
 */
function post_password_required( $post = null ) {
	$post = get_post( $post );

	if ( empty( $post-&gt;post_password ) ) {
		/** This filter is documented in wp-includes/post-template.php */
		return apply_filters( &#039;post_password_required&#039;, false, $post );
	}

	if ( ! isset( $_COOKIE[ &#039;wp-postpass_&#039; . COOKIEHASH ] ) ) {
		/** This filter is documented in wp-includes/post-template.php */
		return apply_filters( &#039;post_password_required&#039;, true, $post );
	}

	require_once ABSPATH . WPINC . &#039;/class-phpass.php&#039;;
	$hasher = new PasswordHash( 8, true );

	$hash = wp_unslash( $_COOKIE[ &#039;wp-postpass_&#039; . COOKIEHASH ] );
	if ( ! str_starts_with( $hash, &#039;$P$B&#039; ) ) {
		$required = true;
	} else {
		$required = ! $hasher-&gt;CheckPassword( $post-&gt;post_password, $hash );
	}

	/**
	 * Filters whether a post requires the user to supply a password.
	 *
	 * @since 4.7.0
	 *
	 * @param bool    $required Whether the user needs to supply a password. True if password has not been
	 *                          provided or is incorrect, false if password has been supplied or is not required.
	 * @param WP_Post $post     Post object.
	 */
	return apply_filters( &#039;post_password_required&#039;, $required, $post );
}

//
// Page Template Functions for usage in Themes.
//

/**
 * The formatted output of a list of pages.
 *
 * Displays page links for paginated posts (i.e. including the `&lt;!--nextpage--&gt;`
 * Quicktag one or more times). This tag must be within The Loop.
 *
 * @since 1.2.0
 * @since 5.1.0 Added the `aria_current` argument.
 *
 * @global int $page
 * @global int $numpages
 * @global int $multipage
 * @global int $more
 *
 * @param string|array $args {
 *     Optional. Array or string of default arguments.
 *
 *     @type string       $before           HTML or text to prepend to each link. Default is `&lt;p&gt; Pages:`.
 *     @type string       $after            HTML or text to append to each link. Default is `&lt;/p&gt;`.
 *     @type string       $link_before      HTML or text to prepend to each link, inside the `&lt;a&gt;` tag.
 *                                          Also prepended to the current item, which is not linked. Default empty.
 *     @type string       $link_after       HTML or text to append to each Pages link inside the `&lt;a&gt;` tag.
 *                                          Also appended to the current item, which is not linked. Default empty.
 *     @type string       $aria_current     The value for the aria-current attribute. Possible values are &#039;page&#039;,
 *                                          &#039;step&#039;, &#039;location&#039;, &#039;date&#039;, &#039;time&#039;, &#039;true&#039;, &#039;false&#039;. Default is &#039;page&#039;.
 *     @type string       $next_or_number   Indicates whether page numbers should be used. Valid values are number
 *                                          and next. Default is &#039;number&#039;.
 *     @type string       $separator        Text between pagination links. Default is &#039; &#039;.
 *     @type string       $nextpagelink     Link text for the next page link, if available. Default is &#039;Next Page&#039;.
 *     @type string       $previouspagelink Link text for the previous page link, if available. Default is &#039;Previous Page&#039;.
 *     @type string       $pagelink         Format string for page numbers. The % in the parameter string will be
 *                                          replaced with the page number, so &#039;Page %&#039; generates &quot;Page 1&quot;, &quot;Page 2&quot;, etc.
 *                                          Defaults to &#039;%&#039;, just the page number.
 *     @type int|bool     $echo             Whether to echo or not. Accepts 1|true or 0|false. Default 1|true.
 * }
 * @return string Formatted output in HTML.
 */
function wp_link_pages( $args = &#039;&#039; ) {
	global $page, $numpages, $multipage, $more;

	$defaults = array(
		&#039;before&#039;           =&gt; &#039;&lt;p class=&quot;post-nav-links&quot;&gt;&#039; . __( &#039;Pages:&#039; ),
		&#039;after&#039;            =&gt; &#039;&lt;/p&gt;&#039;,
		&#039;link_before&#039;      =&gt; &#039;&#039;,
		&#039;link_after&#039;       =&gt; &#039;&#039;,
		&#039;aria_current&#039;     =&gt; &#039;page&#039;,
		&#039;next_or_number&#039;   =&gt; &#039;number&#039;,
		&#039;separator&#039;        =&gt; &#039; &#039;,
		&#039;nextpagelink&#039;     =&gt; __( &#039;Next page&#039; ),
		&#039;previouspagelink&#039; =&gt; __( &#039;Previous page&#039; ),
		&#039;pagelink&#039;         =&gt; &#039;%&#039;,
		&#039;echo&#039;             =&gt; 1,
	);

	$parsed_args = wp_parse_args( $args, $defaults );

	/**
	 * Filters the arguments used in retrieving page links for paginated posts.
	 *
	 * @since 3.0.0
	 *
	 * @param array $parsed_args An array of page link arguments. See wp_link_pages()
	 *                           for information on accepted arguments.
	 */
	$parsed_args = apply_filters( &#039;wp_link_pages_args&#039;, $parsed_args );

	$output = &#039;&#039;;
	if ( $multipage ) {
		if ( &#039;number&#039; === $parsed_args[&#039;next_or_number&#039;] ) {
			$output .= $parsed_args[&#039;before&#039;];
			for ( $i = 1; $i &lt;= $numpages; $i++ ) {
				$link = $parsed_args[&#039;link_before&#039;] . str_replace( &#039;%&#039;, $i, $parsed_args[&#039;pagelink&#039;] ) . $parsed_args[&#039;link_after&#039;];

				if ( $i !== $page || ! $more &amp;&amp; 1 === $page ) {
					$link = _wp_link_page( $i ) . $link . &#039;&lt;/a&gt;&#039;;
				} elseif ( $i === $page ) {
					$link = &#039;&lt;span class=&quot;post-page-numbers current&quot; aria-current=&quot;&#039; . esc_attr( $parsed_args[&#039;aria_current&#039;] ) . &#039;&quot;&gt;&#039; . $link . &#039;&lt;/span&gt;&#039;;
				}

				/**
				 * Filters the HTML output of individual page number links.
				 *
				 * @since 3.6.0
				 *
				 * @param string $link The page number HTML output.
				 * @param int    $i    Page number for paginated posts&#039; page links.
				 */
				$link = apply_filters( &#039;wp_link_pages_link&#039;, $link, $i );

				// Use the custom links separator beginning with the second link.
				$output .= ( 1 === $i ) ? &#039; &#039; : $parsed_args[&#039;separator&#039;];
				$output .= $link;
			}
			$output .= $parsed_args[&#039;after&#039;];
		} elseif ( $more ) {
			$output .= $parsed_args[&#039;before&#039;];
			$prev    = $page - 1;
			if ( $prev &gt; 0 ) {
				$link = _wp_link_page( $prev ) . $parsed_args[&#039;link_before&#039;] . $parsed_args[&#039;previouspagelink&#039;] . $parsed_args[&#039;link_after&#039;] . &#039;&lt;/a&gt;&#039;;

				/** This filter is documented in wp-includes/post-template.php */
				$output .= apply_filters( &#039;wp_link_pages_link&#039;, $link, $prev );
			}
			$next = $page + 1;
			if ( $next &lt;= $numpages ) {
				if ( $prev ) {
					$output .= $parsed_args[&#039;separator&#039;];
				}
				$link = _wp_link_page( $next ) . $parsed_args[&#039;link_before&#039;] . $parsed_args[&#039;nextpagelink&#039;] . $parsed_args[&#039;link_after&#039;] . &#039;&lt;/a&gt;&#039;;

				/** This filter is documented in wp-includes/post-template.php */
				$output .= apply_filters( &#039;wp_link_pages_link&#039;, $link, $next );
			}
			$output .= $parsed_args[&#039;after&#039;];
		}
	}

	/**
	 * Filters the HTML output of page links for paginated posts.
	 *
	 * @since 3.6.0
	 *
	 * @param string       $output HTML output of paginated posts&#039; page links.
	 * @param array|string $args   An array or query string of arguments. See wp_link_pages()
	 *                             for information on accepted arguments.
	 */
	$html = apply_filters( &#039;wp_link_pages&#039;, $output, $args );

	if ( $parsed_args[&#039;echo&#039;] ) {
		echo $html;
	}
	return $html;
}

/**
 * Helper function for wp_link_pages().
 *
 * @since 3.1.0
 * @access private
 *
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 *
 * @param int $i Page number.
 * @return string Link.
 */
function _wp_link_page( $i ) {
	global $wp_rewrite;
	$post       = get_post();
	$query_args = array();

	if ( 1 === $i ) {
		$url = get_permalink();
	} else {
		if ( ! get_option( &#039;permalink_structure&#039; ) || in_array( $post-&gt;post_status, array( &#039;draft&#039;, &#039;pending&#039; ), true ) ) {
			$url = add_query_arg( &#039;page&#039;, $i, get_permalink() );
		} elseif ( &#039;page&#039; === get_option( &#039;show_on_front&#039; ) &amp;&amp; (int) get_option( &#039;page_on_front&#039; ) === $post-&gt;ID ) {
			$url = trailingslashit( get_permalink() ) . user_trailingslashit( &quot;$wp_rewrite-&gt;pagination_base/&quot; . $i, &#039;single_paged&#039; );
		} else {
			$url = trailingslashit( get_permalink() ) . user_trailingslashit( $i, &#039;single_paged&#039; );
		}
	}

	if ( is_preview() ) {

		if ( ( &#039;draft&#039; !== $post-&gt;post_status ) &amp;&amp; isset( $_GET[&#039;preview_id&#039;], $_GET[&#039;preview_nonce&#039;] ) ) {
			$query_args[&#039;preview_id&#039;]    = wp_unslash( $_GET[&#039;preview_id&#039;] );
			$query_args[&#039;preview_nonce&#039;] = wp_unslash( $_GET[&#039;preview_nonce&#039;] );
		}

		$url = get_preview_post_link( $post, $query_args, $url );
	}

	return &#039;&lt;a href=&quot;&#039; . esc_url( $url ) . &#039;&quot; class=&quot;post-page-numbers&quot;&gt;&#039;;
}

//
// Post-meta: Custom per-post fields.
//

/**
 * Retrieves post custom meta data field.
 *
 * @since 1.5.0
 *
 * @param string $key Meta data key name.
 * @return array|string|false Array of values, or single value if only one element exists.
 *                            False if the key does not exist.
 */
function post_custom( $key = &#039;&#039; ) {
	$custom = get_post_custom();

	if ( ! isset( $custom[ $key ] ) ) {
		return false;
	} elseif ( 1 === count( $custom[ $key ] ) ) {
		return $custom[ $key ][0];
	} else {
		return $custom[ $key ];
	}
}

/**
 * Displays a list of post custom fields.
 *
 * @since 1.2.0
 *
 * @deprecated 6.0.2 Use get_post_meta() to retrieve post meta and render manually.
 */
function the_meta() {
	_deprecated_function( __FUNCTION__, &#039;6.0.2&#039;, &#039;get_post_meta()&#039; );
	$keys = get_post_custom_keys();
	if ( $keys ) {
		$li_html = &#039;&#039;;
		foreach ( (array) $keys as $key ) {
			$keyt = trim( $key );
			if ( is_protected_meta( $keyt, &#039;post&#039; ) ) {
				continue;
			}

			$values = array_map( &#039;trim&#039;, get_post_custom_values( $key ) );
			$value  = implode( &#039;, &#039;, $values );

			$html = sprintf(
				&quot;&lt;li&gt;&lt;span class=&#039;post-meta-key&#039;&gt;%s&lt;/span&gt; %s&lt;/li&gt;\n&quot;,
				/* translators: %s: Post custom field name. */
				esc_html( sprintf( _x( &#039;%s:&#039;, &#039;Post custom field name&#039; ), $key ) ),
				esc_html( $value )
			);

			/**
			 * Filters the HTML output of the li element in the post custom fields list.
			 *
			 * @since 2.2.0
			 *
			 * @param string $html  The HTML output for the li element.
			 * @param string $key   Meta key.
			 * @param string $value Meta value.
			 */
			$li_html .= apply_filters( &#039;the_meta_key&#039;, $html, $key, $value );
		}

		if ( $li_html ) {
			echo &quot;&lt;ul class=&#039;post-meta&#039;&gt;\n{$li_html}&lt;/ul&gt;\n&quot;;
		}
	}
}

//
// Pages.
//

/**
 * Retrieves or displays a list of pages as a dropdown (select list).
 *
 * @since 2.1.0
 * @since 4.2.0 The `$value_field` argument was added.
 * @since 4.3.0 The `$class` argument was added.
 *
 * @see get_pages()
 *
 * @param array|string $args {
 *     Optional. Array or string of arguments to generate a page dropdown. See get_pages() for additional arguments.
 *
 *     @type int          $depth                 Maximum depth. Default 0.
 *     @type int          $child_of              Page ID to retrieve child pages of. Default 0.
 *     @type int|string   $selected              Value of the option that should be selected. Default 0.
 *     @type bool|int     $echo                  Whether to echo or return the generated markup. Accepts 0, 1,
 *                                               or their bool equivalents. Default 1.
 *     @type string       $name                  Value for the &#039;name&#039; attribute of the select element.
 *                                               Default &#039;page_id&#039;.
 *     @type string       $id                    Value for the &#039;id&#039; attribute of the select element.
 *     @type string       $class                 Value for the &#039;class&#039; attribute of the select element. Default: none.
 *                                               Defaults to the value of `$name`.
 *     @type string       $show_option_none      Text to display for showing no pages. Default empty (does not display).
 *     @type string       $show_option_no_change Text to display for &quot;no change&quot; option. Default empty (does not display).
 *     @type string       $option_none_value     Value to use when no page is selected. Default empty.
 *     @type string       $value_field           Post field used to populate the &#039;value&#039; attribute of the option
 *                                               elements. Accepts any valid post field. Default &#039;ID&#039;.
 * }
 * @return string HTML dropdown list of pages.
 */
function wp_dropdown_pages( $args = &#039;&#039; ) {
	$defaults = array(
		&#039;depth&#039;                 =&gt; 0,
		&#039;child_of&#039;              =&gt; 0,
		&#039;selected&#039;              =&gt; 0,
		&#039;echo&#039;                  =&gt; 1,
		&#039;name&#039;                  =&gt; &#039;page_id&#039;,
		&#039;id&#039;                    =&gt; &#039;&#039;,
		&#039;class&#039;                 =&gt; &#039;&#039;,
		&#039;show_option_none&#039;      =&gt; &#039;&#039;,
		&#039;show_option_no_change&#039; =&gt; &#039;&#039;,
		&#039;option_none_value&#039;     =&gt; &#039;&#039;,
		&#039;value_field&#039;           =&gt; &#039;ID&#039;,
	);

	$parsed_args = wp_parse_args( $args, $defaults );

	$pages  = get_pages( $parsed_args );
	$output = &#039;&#039;;
	// Back-compat with old system where both id and name were based on $name argument.
	if ( empty( $parsed_args[&#039;id&#039;] ) ) {
		$parsed_args[&#039;id&#039;] = $parsed_args[&#039;name&#039;];
	}

	if ( ! empty( $pages ) ) {
		$class = &#039;&#039;;
		if ( ! empty( $parsed_args[&#039;class&#039;] ) ) {
			$class = &quot; class=&#039;&quot; . esc_attr( $parsed_args[&#039;class&#039;] ) . &quot;&#039;&quot;;
		}

		$output = &quot;&lt;select name=&#039;&quot; . esc_attr( $parsed_args[&#039;name&#039;] ) . &quot;&#039;&quot; . $class . &quot; id=&#039;&quot; . esc_attr( $parsed_args[&#039;id&#039;] ) . &quot;&#039;&gt;\n&quot;;
		if ( $parsed_args[&#039;show_option_no_change&#039;] ) {
			$output .= &quot;\t&lt;option value=\&quot;-1\&quot;&gt;&quot; . $parsed_args[&#039;show_option_no_change&#039;] . &quot;&lt;/option&gt;\n&quot;;
		}
		if ( $parsed_args[&#039;show_option_none&#039;] ) {
			$output .= &quot;\t&lt;option value=\&quot;&quot; . esc_attr( $parsed_args[&#039;option_none_value&#039;] ) . &#039;&quot;&gt;&#039; . $parsed_args[&#039;show_option_none&#039;] . &quot;&lt;/option&gt;\n&quot;;
		}
		$output .= walk_page_dropdown_tree( $pages, $parsed_args[&#039;depth&#039;], $parsed_args );
		$output .= &quot;&lt;/select&gt;\n&quot;;
	}

	/**
	 * Filters the HTML output of a list of pages as a dropdown.
	 *
	 * @since 2.1.0
	 * @since 4.4.0 `$parsed_args` and `$pages` added as arguments.
	 *
	 * @param string    $output      HTML output for dropdown list of pages.
	 * @param array     $parsed_args The parsed arguments array. See wp_dropdown_pages()
	 *                               for information on accepted arguments.
	 * @param WP_Post[] $pages       Array of the page objects.
	 */
	$html = apply_filters( &#039;wp_dropdown_pages&#039;, $output, $parsed_args, $pages );

	if ( $parsed_args[&#039;echo&#039;] ) {
		echo $html;
	}

	return $html;
}

/**
 * Retrieves or displays a list of pages (or hierarchical post type items) in list (li) format.
 *
 * @since 1.5.0
 * @since 4.7.0 Added the `item_spacing` argument.
 *
 * @see get_pages()
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param array|string $args {
 *     Optional. Array or string of arguments to generate a list of pages. See get_pages() for additional arguments.
 *
 *     @type int          $child_of     Display only the sub-pages of a single page by ID. Default 0 (all pages).
 *     @type string       $authors      Comma-separated list of author IDs. Default empty (all authors).
 *     @type string       $date_format  PHP date format to use for the listed pages. Relies on the &#039;show_date&#039; parameter.
 *                                      Default is the value of &#039;date_format&#039; option.
 *     @type int          $depth        Number of levels in the hierarchy of pages to include in the generated list.
 *                                      Accepts -1 (any depth), 0 (all pages), 1 (top-level pages only), and n (pages to
 *                                      the given n depth). Default 0.
 *     @type bool         $echo         Whether or not to echo the list of pages. Default true.
 *     @type string       $exclude      Comma-separated list of page IDs to exclude. Default empty.
 *     @type array        $include      Comma-separated list of page IDs to include. Default empty.
 *     @type string       $link_after   Text or HTML to follow the page link label. Default null.
 *     @type string       $link_before  Text or HTML to precede the page link label. Default null.
 *     @type string       $post_type    Post type to query for. Default &#039;page&#039;.
 *     @type string|array $post_status  Comma-separated list or array of post statuses to include. Default &#039;publish&#039;.
 *     @type string       $show_date    Whether to display the page publish or modified date for each page. Accepts
 *                                      &#039;modified&#039; or any other value. An empty value hides the date. Default empty.
 *     @type string       $sort_column  Comma-separated list of column names to sort the pages by. Accepts &#039;post_author&#039;,
 *                                      &#039;post_date&#039;, &#039;post_title&#039;, &#039;post_name&#039;, &#039;post_modified&#039;, &#039;post_modified_gmt&#039;,
 *                                      &#039;menu_order&#039;, &#039;post_parent&#039;, &#039;ID&#039;, &#039;rand&#039;, or &#039;comment_count&#039;. Default &#039;post_title&#039;.
 *     @type string       $title_li     List heading. Passing a null or empty value will result in no heading, and the list
 *                                      will not be wrapped with unordered list `&lt;ul&gt;` tags. Default &#039;Pages&#039;.
 *     @type string       $item_spacing Whether to preserve whitespace within the menu&#039;s HTML. Accepts &#039;preserve&#039; or &#039;discard&#039;.
 *                                      Default &#039;preserve&#039;.
 *     @type Walker       $walker       Walker instance to use for listing pages. Default empty which results in a
 *                                      Walker_Page instance being used.
 * }
 * @return void|string Void if &#039;echo&#039; argument is true, HTML list of pages if &#039;echo&#039; is false.
 */
function wp_list_pages( $args = &#039;&#039; ) {
	$defaults = array(
		&#039;depth&#039;        =&gt; 0,
		&#039;show_date&#039;    =&gt; &#039;&#039;,
		&#039;date_format&#039;  =&gt; get_option( &#039;date_format&#039; ),
		&#039;child_of&#039;     =&gt; 0,
		&#039;exclude&#039;      =&gt; &#039;&#039;,
		&#039;title_li&#039;     =&gt; __( &#039;Pages&#039; ),
		&#039;echo&#039;         =&gt; 1,
		&#039;authors&#039;      =&gt; &#039;&#039;,
		&#039;sort_column&#039;  =&gt; &#039;menu_order, post_title&#039;,
		&#039;link_before&#039;  =&gt; &#039;&#039;,
		&#039;link_after&#039;   =&gt; &#039;&#039;,
		&#039;item_spacing&#039; =&gt; &#039;preserve&#039;,
		&#039;walker&#039;       =&gt; &#039;&#039;,
	);

	$parsed_args = wp_parse_args( $args, $defaults );

	if ( ! in_array( $parsed_args[&#039;item_spacing&#039;], array( &#039;preserve&#039;, &#039;discard&#039; ), true ) ) {
		// Invalid value, fall back to default.
		$parsed_args[&#039;item_spacing&#039;] = $defaults[&#039;item_spacing&#039;];
	}

	$output       = &#039;&#039;;
	$current_page = 0;

	// Sanitize, mostly to keep spaces out.
	$parsed_args[&#039;exclude&#039;] = preg_replace( &#039;/[^0-9,]/&#039;, &#039;&#039;, $parsed_args[&#039;exclude&#039;] );

	// Allow plugins to filter an array of excluded pages (but don&#039;t put a nullstring into the array).
	$exclude_array = ( $parsed_args[&#039;exclude&#039;] ) ? explode( &#039;,&#039;, $parsed_args[&#039;exclude&#039;] ) : array();

	/**
	 * Filters the array of pages to exclude from the pages list.
	 *
	 * @since 2.1.0
	 *
	 * @param string[] $exclude_array An array of page IDs to exclude.
	 */
	$parsed_args[&#039;exclude&#039;] = implode( &#039;,&#039;, apply_filters( &#039;wp_list_pages_excludes&#039;, $exclude_array ) );

	$parsed_args[&#039;hierarchical&#039;] = 0;

	// Query pages.
	$pages = get_pages( $parsed_args );

	if ( ! empty( $pages ) ) {
		if ( $parsed_args[&#039;title_li&#039;] ) {
			$output .= &#039;&lt;li class=&quot;pagenav&quot;&gt;&#039; . $parsed_args[&#039;title_li&#039;] . &#039;&lt;ul&gt;&#039;;
		}
		global $wp_query;
		if ( is_page() || is_attachment() || $wp_query-&gt;is_posts_page ) {
			$current_page = get_queried_object_id();
		} elseif ( is_singular() ) {
			$queried_object = get_queried_object();
			if ( is_post_type_hierarchical( $queried_object-&gt;post_type ) ) {
				$current_page = $queried_object-&gt;ID;
			}
		}

		$output .= walk_page_tree( $pages, $parsed_args[&#039;depth&#039;], $current_page, $parsed_args );

		if ( $parsed_args[&#039;title_li&#039;] ) {
			$output .= &#039;&lt;/ul&gt;&lt;/li&gt;&#039;;
		}
	}

	/**
	 * Filters the HTML output of the pages to list.
	 *
	 * @since 1.5.1
	 * @since 4.4.0 `$pages` added as arguments.
	 *
	 * @see wp_list_pages()
	 *
	 * @param string    $output      HTML output of the pages list.
	 * @param array     $parsed_args An array of page-listing arguments. See wp_list_pages()
	 *                               for information on accepted arguments.
	 * @param WP_Post[] $pages       Array of the page objects.
	 */
	$html = apply_filters( &#039;wp_list_pages&#039;, $output, $parsed_args, $pages );

	if ( $parsed_args[&#039;echo&#039;] ) {
		echo $html;
	} else {
		return $html;
	}
}

/**
 * Displays or retrieves a list of pages with an optional home link.
 *
 * The arguments are listed below and part of the arguments are for wp_list_pages() function.
 * Check that function for more info on those arguments.
 *
 * @since 2.7.0
 * @since 4.4.0 Added `menu_id`, `container`, `before`, `after`, and `walker` arguments.
 * @since 4.7.0 Added the `item_spacing` argument.
 *
 * @param array|string $args {
 *     Optional. Array or string of arguments to generate a page menu. See wp_list_pages() for additional arguments.
 *
 *     @type string          $sort_column  How to sort the list of pages. Accepts post column names.
 *                                         Default &#039;menu_order, post_title&#039;.
 *     @type string          $menu_id      ID for the div containing the page list. Default is empty string.
 *     @type string          $menu_class   Class to use for the element containing the page list. Default &#039;menu&#039;.
 *     @type string          $container    Element to use for the element containing the page list. Default &#039;div&#039;.
 *     @type bool            $echo         Whether to echo the list or return it. Accepts true (echo) or false (return).
 *                                         Default true.
 *     @type int|bool|string $show_home    Whether to display the link to the home page. Can just enter the text
 *                                         you&#039;d like shown for the home link. 1|true defaults to &#039;Home&#039;.
 *     @type string          $link_before  The HTML or text to prepend to $show_home text. Default empty.
 *     @type string          $link_after   The HTML or text to append to $show_home text. Default empty.
 *     @type string          $before       The HTML or text to prepend to the menu. Default is &#039;&lt;ul&gt;&#039;.
 *     @type string          $after        The HTML or text to append to the menu. Default is &#039;&lt;/ul&gt;&#039;.
 *     @type string          $item_spacing Whether to preserve whitespace within the menu&#039;s HTML. Accepts &#039;preserve&#039;
 *                                         or &#039;discard&#039;. Default &#039;discard&#039;.
 *     @type Walker          $walker       Walker instance to use for listing pages. Default empty which results in a
 *                                         Walker_Page instance being used.
 * }
 * @return void|string Void if &#039;echo&#039; argument is true, HTML menu if &#039;echo&#039; is false.
 */
function wp_page_menu( $args = array() ) {
	$defaults = array(
		&#039;sort_column&#039;  =&gt; &#039;menu_order, post_title&#039;,
		&#039;menu_id&#039;      =&gt; &#039;&#039;,
		&#039;menu_class&#039;   =&gt; &#039;menu&#039;,
		&#039;container&#039;    =&gt; &#039;div&#039;,
		&#039;echo&#039;         =&gt; true,
		&#039;link_before&#039;  =&gt; &#039;&#039;,
		&#039;link_after&#039;   =&gt; &#039;&#039;,
		&#039;before&#039;       =&gt; &#039;&lt;ul&gt;&#039;,
		&#039;after&#039;        =&gt; &#039;&lt;/ul&gt;&#039;,
		&#039;item_spacing&#039; =&gt; &#039;discard&#039;,
		&#039;walker&#039;       =&gt; &#039;&#039;,
	);
	$args     = wp_parse_args( $args, $defaults );

	if ( ! in_array( $args[&#039;item_spacing&#039;], array( &#039;preserve&#039;, &#039;discard&#039; ), true ) ) {
		// Invalid value, fall back to default.
		$args[&#039;item_spacing&#039;] = $defaults[&#039;item_spacing&#039;];
	}

	if ( &#039;preserve&#039; === $args[&#039;item_spacing&#039;] ) {
		$t = &quot;\t&quot;;
		$n = &quot;\n&quot;;
	} else {
		$t = &#039;&#039;;
		$n = &#039;&#039;;
	}

	/**
	 * Filters the arguments used to generate a page-based menu.
	 *
	 * @since 2.7.0
	 *
	 * @see wp_page_menu()
	 *
	 * @param array $args An array of page menu arguments. See wp_page_menu()
	 *                    for information on accepted arguments.
	 */
	$args = apply_filters( &#039;wp_page_menu_args&#039;, $args );

	$menu = &#039;&#039;;

	$list_args = $args;

	// Show Home in the menu.
	if ( ! empty( $args[&#039;show_home&#039;] ) ) {
		if ( true === $args[&#039;show_home&#039;] || &#039;1&#039; === $args[&#039;show_home&#039;] || 1 === $args[&#039;show_home&#039;] ) {
			$text = __( &#039;Home&#039; );
		} else {
			$text = $args[&#039;show_home&#039;];
		}
		$class = &#039;&#039;;
		if ( is_front_page() &amp;&amp; ! is_paged() ) {
			$class = &#039;class=&quot;current_page_item&quot;&#039;;
		}
		$menu .= &#039;&lt;li &#039; . $class . &#039;&gt;&lt;a href=&quot;&#039; . esc_url( home_url( &#039;/&#039; ) ) . &#039;&quot;&gt;&#039; . $args[&#039;link_before&#039;] . $text . $args[&#039;link_after&#039;] . &#039;&lt;/a&gt;&lt;/li&gt;&#039;;
		// If the front page is a page, add it to the exclude list.
		if ( &#039;page&#039; === get_option( &#039;show_on_front&#039; ) ) {
			if ( ! empty( $list_args[&#039;exclude&#039;] ) ) {
				$list_args[&#039;exclude&#039;] .= &#039;,&#039;;
			} else {
				$list_args[&#039;exclude&#039;] = &#039;&#039;;
			}
			$list_args[&#039;exclude&#039;] .= get_option( &#039;page_on_front&#039; );
		}
	}

	$list_args[&#039;echo&#039;]     = false;
	$list_args[&#039;title_li&#039;] = &#039;&#039;;
	$menu                 .= wp_list_pages( $list_args );

	$container = sanitize_text_field( $args[&#039;container&#039;] );

	// Fallback in case `wp_nav_menu()` was called without a container.
	if ( empty( $container ) ) {
		$container = &#039;div&#039;;
	}

	if ( $menu ) {

		// wp_nav_menu() doesn&#039;t set before and after.
		if ( isset( $args[&#039;fallback_cb&#039;] ) &amp;&amp;
			&#039;wp_page_menu&#039; === $args[&#039;fallback_cb&#039;] &amp;&amp;
			&#039;ul&#039; !== $container ) {
			$args[&#039;before&#039;] = &quot;&lt;ul&gt;{$n}&quot;;
			$args[&#039;after&#039;]  = &#039;&lt;/ul&gt;&#039;;
		}

		$menu = $args[&#039;before&#039;] . $menu . $args[&#039;after&#039;];
	}

	$attrs = &#039;&#039;;
	if ( ! empty( $args[&#039;menu_id&#039;] ) ) {
		$attrs .= &#039; id=&quot;&#039; . esc_attr( $args[&#039;menu_id&#039;] ) . &#039;&quot;&#039;;
	}

	if ( ! empty( $args[&#039;menu_class&#039;] ) ) {
		$attrs .= &#039; class=&quot;&#039; . esc_attr( $args[&#039;menu_class&#039;] ) . &#039;&quot;&#039;;
	}

	$menu = &quot;&lt;{$container}{$attrs}&gt;&quot; . $menu . &quot;&lt;/{$container}&gt;{$n}&quot;;

	/**
	 * Filters the HTML output of a page-based menu.
	 *
	 * @since 2.7.0
	 *
	 * @see wp_page_menu()
	 *
	 * @param string $menu The HTML output.
	 * @param array  $args An array of arguments. See wp_page_menu()
	 *                     for information on accepted arguments.
	 */
	$menu = apply_filters( &#039;wp_page_menu&#039;, $menu, $args );

	if ( $args[&#039;echo&#039;] ) {
		echo $menu;
	} else {
		return $menu;
	}
}

//
// Page helpers.
//

/**
 * Retrieves HTML list content for page list.
 *
 * @uses Walker_Page to create HTML list content.
 * @since 2.1.0
 *
 * @param array $pages
 * @param int   $depth
 * @param int   $current_page
 * @param array $args
 * @return string
 */
function walk_page_tree( $pages, $depth, $current_page, $args ) {
	if ( empty( $args[&#039;walker&#039;] ) ) {
		$walker = new Walker_Page();
	} else {
		/**
		 * @var Walker $walker
		 */
		$walker = $args[&#039;walker&#039;];
	}

	foreach ( (array) $pages as $page ) {
		if ( $page-&gt;post_parent ) {
			$args[&#039;pages_with_children&#039;][ $page-&gt;post_parent ] = true;
		}
	}

	return $walker-&gt;walk( $pages, $depth, $args, $current_page );
}

/**
 * Retrieves HTML dropdown (select) content for page list.
 *
 * @since 2.1.0
 * @since 5.3.0 Formalized the existing `...$args` parameter by adding it
 *              to the function signature.
 *
 * @uses Walker_PageDropdown to create HTML dropdown content.
 * @see Walker_PageDropdown::walk() for parameters and return description.
 *
 * @param mixed ...$args Elements array, maximum hierarchical depth and optional additional arguments.
 * @return string
 */
function walk_page_dropdown_tree( ...$args ) {
	if ( empty( $args[2][&#039;walker&#039;] ) ) { // The user&#039;s options are the third parameter.
		$walker = new Walker_PageDropdown();
	} else {
		/**
		 * @var Walker $walker
		 */
		$walker = $args[2][&#039;walker&#039;];
	}

	return $walker-&gt;walk( ...$args );
}

//
// Attachments.
//

/**
 * Displays an attachment page link using an image or icon.
 *
 * @since 2.0.0
 *
 * @param int|WP_Post $post       Optional. Post ID or post object.
 * @param bool        $fullsize   Optional. Whether to use full size. Default false.
 * @param bool        $deprecated Deprecated. Not used.
 * @param bool        $permalink Optional. Whether to include permalink. Default false.
 */
function the_attachment_link( $post = 0, $fullsize = false, $deprecated = false, $permalink = false ) {
	if ( ! empty( $deprecated ) ) {
		_deprecated_argument( __FUNCTION__, &#039;2.5.0&#039; );
	}

	if ( $fullsize ) {
		echo wp_get_attachment_link( $post, &#039;full&#039;, $permalink );
	} else {
		echo wp_get_attachment_link( $post, &#039;thumbnail&#039;, $permalink );
	}
}

/**
 * Retrieves an attachment page link using an image or icon, if possible.
 *
 * @since 2.5.0
 * @since 4.4.0 The `$post` parameter can now accept either a post ID or `WP_Post` object.
 *
 * @param int|WP_Post  $post      Optional. Post ID or post object.
 * @param string|int[] $size      Optional. Image size. Accepts any registered image size name, or an array
 *                                of width and height values in pixels (in that order). Default &#039;thumbnail&#039;.
 * @param bool         $permalink Optional. Whether to add permalink to image. Default false.
 * @param bool         $icon      Optional. Whether the attachment is an icon. Default false.
 * @param string|false $text      Optional. Link text to use. Activated by passing a string, false otherwise.
 *                                Default false.
 * @param array|string $attr      Optional. Array or string of attributes. Default empty.
 * @return string HTML content.
 */
function wp_get_attachment_link( $post = 0, $size = &#039;thumbnail&#039;, $permalink = false, $icon = false, $text = false, $attr = &#039;&#039; ) {
	$_post = get_post( $post );

	if ( empty( $_post ) || ( &#039;attachment&#039; !== $_post-&gt;post_type ) || ! wp_get_attachment_url( $_post-&gt;ID ) ) {
		return __( &#039;Missing Attachment&#039; );
	}

	$url = wp_get_attachment_url( $_post-&gt;ID );

	if ( $permalink ) {
		$url = get_attachment_link( $_post-&gt;ID );
	}

	if ( $text ) {
		$link_text = $text;
	} elseif ( $size &amp;&amp; &#039;none&#039; !== $size ) {
		$link_text = wp_get_attachment_image( $_post-&gt;ID, $size, $icon, $attr );
	} else {
		$link_text = &#039;&#039;;
	}

	if ( &#039;&#039; === trim( $link_text ) ) {
		$link_text = $_post-&gt;post_title;
	}

	if ( &#039;&#039; === trim( $link_text ) ) {
		$link_text = esc_html( pathinfo( get_attached_file( $_post-&gt;ID ), PATHINFO_FILENAME ) );
	}

	/**
	 * Filters the list of attachment link attributes.
	 *
	 * @since 6.2.0
	 *
	 * @param array $attributes An array of attributes for the link markup,
	 *                          keyed on the attribute name.
	 * @param int   $id         Post ID.
	 */
	$attributes = apply_filters( &#039;wp_get_attachment_link_attributes&#039;, array( &#039;href&#039; =&gt; $url ), $_post-&gt;ID );

	$link_attributes = &#039;&#039;;
	foreach ( $attributes as $name =&gt; $value ) {
		$value            = &#039;href&#039; === $name ? esc_url( $value ) : esc_attr( $value );
		$link_attributes .= &#039; &#039; . esc_attr( $name ) . &quot;=&#039;&quot; . $value . &quot;&#039;&quot;;
	}

	$link_html = &quot;&lt;a$link_attributes&gt;$link_text&lt;/a&gt;&quot;;

	/**
	 * Filters a retrieved attachment page link.
	 *
	 * @since 2.7.0
	 * @since 5.1.0 Added the `$attr` parameter.
	 *
	 * @param string       $link_html The page link HTML output.
	 * @param int|WP_Post  $post      Post ID or object. Can be 0 for the current global post.
	 * @param string|int[] $size      Requested image size. Can be any registered image size name, or
	 *                                an array of width and height values in pixels (in that order).
	 * @param bool         $permalink Whether to add permalink to image. Default false.
	 * @param bool         $icon      Whether to include an icon.
	 * @param string|false $text      If string, will be link text.
	 * @param array|string $attr      Array or string of attributes.
	 */
	return apply_filters( &#039;wp_get_attachment_link&#039;, $link_html, $post, $size, $permalink, $icon, $text, $attr );
}

/**
 * Wraps attachment in paragraph tag before content.
 *
 * @since 2.0.0
 *
 * @param string $content
 * @return string
 */
function prepend_attachment( $content ) {
	$post = get_post();

	if ( empty( $post-&gt;post_type ) || &#039;attachment&#039; !== $post-&gt;post_type ) {
		return $content;
	}

	if ( wp_attachment_is( &#039;video&#039;, $post ) ) {
		$meta = wp_get_attachment_metadata( get_the_ID() );
		$atts = array( &#039;src&#039; =&gt; wp_get_attachment_url() );
		if ( ! empty( $meta[&#039;width&#039;] ) &amp;&amp; ! empty( $meta[&#039;height&#039;] ) ) {
			$atts[&#039;width&#039;]  = (int) $meta[&#039;width&#039;];
			$atts[&#039;height&#039;] = (int) $meta[&#039;height&#039;];
		}
		if ( has_post_thumbnail() ) {
			$atts[&#039;poster&#039;] = wp_get_attachment_url( get_post_thumbnail_id() );
		}
		$p = wp_video_shortcode( $atts );
	} elseif ( wp_attachment_is( &#039;audio&#039;, $post ) ) {
		$p = wp_audio_shortcode( array( &#039;src&#039; =&gt; wp_get_attachment_url() ) );
	} else {
		$p = &#039;&lt;p class=&quot;attachment&quot;&gt;&#039;;
		// Show the medium sized image representation of the attachment if available, and link to the raw file.
		$p .= wp_get_attachment_link( 0, &#039;medium&#039;, false );
		$p .= &#039;&lt;/p&gt;&#039;;
	}

	/**
	 * Filters the attachment markup to be prepended to the post content.
	 *
	 * @since 2.0.0
	 *
	 * @see prepend_attachment()
	 *
	 * @param string $p The attachment HTML output.
	 */
	$p = apply_filters( &#039;prepend_attachment&#039;, $p );

	return &quot;$p\n$content&quot;;
}

//
// Misc.
//

/**
 * Retrieves protected post password form content.
 *
 * @since 1.0.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return string HTML content for password form for password protected post.
 */
function get_the_password_form( $post = 0 ) {
	$post   = get_post( $post );
	$label  = &#039;pwbox-&#039; . ( empty( $post-&gt;ID ) ? rand() : $post-&gt;ID );
	$output = &#039;&lt;form action=&quot;&#039; . esc_url( site_url( &#039;wp-login.php?action=postpass&#039;, &#039;login_post&#039; ) ) . &#039;&quot; class=&quot;post-password-form&quot; method=&quot;post&quot;&gt;
	&lt;p&gt;&#039; . __( &#039;This content is password protected. To view it please enter your password below:&#039; ) . &#039;&lt;/p&gt;
	&lt;p&gt;&lt;label for=&quot;&#039; . $label . &#039;&quot;&gt;&#039; . __( &#039;Password:&#039; ) . &#039; &lt;input name=&quot;post_password&quot; id=&quot;&#039; . $label . &#039;&quot; type=&quot;password&quot; spellcheck=&quot;false&quot; size=&quot;20&quot; /&gt;&lt;/label&gt; &lt;input type=&quot;submit&quot; name=&quot;Submit&quot; value=&quot;&#039; . esc_attr_x( &#039;Enter&#039;, &#039;post password form&#039; ) . &#039;&quot; /&gt;&lt;/p&gt;&lt;/form&gt;
	&#039;;

	/**
	 * Filters the HTML output for the protected post password form.
	 *
	 * If modifying the password field, please note that the core database schema
	 * limits the password field to 20 characters regardless of the value of the
	 * size attribute in the form input.
	 *
	 * @since 2.7.0
	 * @since 5.8.0 Added the `$post` parameter.
	 *
	 * @param string  $output The password form HTML output.
	 * @param WP_Post $post   Post object.
	 */
	return apply_filters( &#039;the_password_form&#039;, $output, $post );
}

/**
 * Determines whether the current post uses a page template.
 *
 * This template tag allows you to determine if you are in a page template.
 * You can optionally provide a template filename or array of template filenames
 * and then the check will be specific to that template.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.5.0
 * @since 4.2.0 The `$template` parameter was changed to also accept an array of page templates.
 * @since 4.7.0 Now works with any post type, not just pages.
 *
 * @param string|string[] $template The specific template filename or array of templates to match.
 * @return bool True on success, false on failure.
 */
function is_page_template( $template = &#039;&#039; ) {
	if ( ! is_singular() ) {
		return false;
	}

	$page_template = get_page_template_slug( get_queried_object_id() );

	if ( empty( $template ) ) {
		return (bool) $page_template;
	}

	if ( $template === $page_template ) {
		return true;
	}

	if ( is_array( $template ) ) {
		if ( ( in_array( &#039;default&#039;, $template, true ) &amp;&amp; ! $page_template )
			|| in_array( $page_template, $template, true )
		) {
			return true;
		}
	}

	return ( &#039;default&#039; === $template &amp;&amp; ! $page_template );
}

/**
 * Gets the specific template filename for a given post.
 *
 * @since 3.4.0
 * @since 4.7.0 Now works with any post type, not just pages.
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return string|false Page template filename. Returns an empty string when the default page template
 *                      is in use. Returns false if the post does not exist.
 */
function get_page_template_slug( $post = null ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return false;
	}

	$template = get_post_meta( $post-&gt;ID, &#039;_wp_page_template&#039;, true );

	if ( ! $template || &#039;default&#039; === $template ) {
		return &#039;&#039;;
	}

	return $template;
}

/**
 * Retrieves formatted date timestamp of a revision (linked to that revisions&#039;s page).
 *
 * @since 2.6.0
 *
 * @param int|WP_Post $revision Revision ID or revision object.
 * @param bool        $link     Optional. Whether to link to revision&#039;s page. Default true.
 * @return string|false i18n formatted datetimestamp or localized &#039;Current Revision&#039;.
 */
function wp_post_revision_title( $revision, $link = true ) {
	$revision = get_post( $revision );

	if ( ! $revision ) {
		return $revision;
	}

	if ( ! in_array( $revision-&gt;post_type, array( &#039;post&#039;, &#039;page&#039;, &#039;revision&#039; ), true ) ) {
		return false;
	}

	/* translators: Revision date format, see https://www.php.net/manual/datetime.format.php */
	$datef = _x( &#039;F j, Y @ H:i:s&#039;, &#039;revision date format&#039; );
	/* translators: %s: Revision date. */
	$autosavef = __( &#039;%s [Autosave]&#039; );
	/* translators: %s: Revision date. */
	$currentf = __( &#039;%s [Current Revision]&#039; );

	$date      = date_i18n( $datef, strtotime( $revision-&gt;post_modified ) );
	$edit_link = get_edit_post_link( $revision-&gt;ID );
	if ( $link &amp;&amp; current_user_can( &#039;edit_post&#039;, $revision-&gt;ID ) &amp;&amp; $edit_link ) {
		$date = &quot;&lt;a href=&#039;$edit_link&#039;&gt;$date&lt;/a&gt;&quot;;
	}

	if ( ! wp_is_post_revision( $revision ) ) {
		$date = sprintf( $currentf, $date );
	} elseif ( wp_is_post_autosave( $revision ) ) {
		$date = sprintf( $autosavef, $date );
	}

	return $date;
}

/**
 * Retrieves formatted date timestamp of a revision (linked to that revisions&#039;s page).
 *
 * @since 3.6.0
 *
 * @param int|WP_Post $revision Revision ID or revision object.
 * @param bool        $link     Optional. Whether to link to revision&#039;s page. Default true.
 * @return string|false gravatar, user, i18n formatted datetimestamp or localized &#039;Current Revision&#039;.
 */
function wp_post_revision_title_expanded( $revision, $link = true ) {
	$revision = get_post( $revision );

	if ( ! $revision ) {
		return $revision;
	}

	if ( ! in_array( $revision-&gt;post_type, array( &#039;post&#039;, &#039;page&#039;, &#039;revision&#039; ), true ) ) {
		return false;
	}

	$author = get_the_author_meta( &#039;display_name&#039;, $revision-&gt;post_author );
	/* translators: Revision date format, see https://www.php.net/manual/datetime.format.php */
	$datef = _x( &#039;F j, Y @ H:i:s&#039;, &#039;revision date format&#039; );

	$gravatar = get_avatar( $revision-&gt;post_author, 24 );

	$date      = date_i18n( $datef, strtotime( $revision-&gt;post_modified ) );
	$edit_link = get_edit_post_link( $revision-&gt;ID );
	if ( $link &amp;&amp; current_user_can( &#039;edit_post&#039;, $revision-&gt;ID ) &amp;&amp; $edit_link ) {
		$date = &quot;&lt;a href=&#039;$edit_link&#039;&gt;$date&lt;/a&gt;&quot;;
	}

	$revision_date_author = sprintf(
		/* translators: Post revision title. 1: Author avatar, 2: Author name, 3: Time ago, 4: Date. */
		__( &#039;%1$s %2$s, %3$s ago (%4$s)&#039; ),
		$gravatar,
		$author,
		human_time_diff( strtotime( $revision-&gt;post_modified_gmt ) ),
		$date
	);

	/* translators: %s: Revision date with author avatar. */
	$autosavef = __( &#039;%s [Autosave]&#039; );
	/* translators: %s: Revision date with author avatar. */
	$currentf = __( &#039;%s [Current Revision]&#039; );

	if ( ! wp_is_post_revision( $revision ) ) {
		$revision_date_author = sprintf( $currentf, $revision_date_author );
	} elseif ( wp_is_post_autosave( $revision ) ) {
		$revision_date_author = sprintf( $autosavef, $revision_date_author );
	}

	/**
	 * Filters the formatted author and date for a revision.
	 *
	 * @since 4.4.0
	 *
	 * @param string  $revision_date_author The formatted string.
	 * @param WP_Post $revision             The revision object.
	 * @param bool    $link                 Whether to link to the revisions page, as passed into
	 *                                      wp_post_revision_title_expanded().
	 */
	return apply_filters( &#039;wp_post_revision_title_expanded&#039;, $revision_date_author, $revision, $link );
}

/**
 * Displays a list of a post&#039;s revisions.
 *
 * Can output either a UL with edit links or a TABLE with diff interface, and
 * restore action links.
 *
 * @since 2.6.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @param string      $type &#039;all&#039; (default), &#039;revision&#039; or &#039;autosave&#039;
 */
function wp_list_post_revisions( $post = 0, $type = &#039;all&#039; ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return;
	}

	// $args array with (parent, format, right, left, type) deprecated since 3.6.
	if ( is_array( $type ) ) {
		$type = ! empty( $type[&#039;type&#039;] ) ? $type[&#039;type&#039;] : $type;
		_deprecated_argument( __FUNCTION__, &#039;3.6.0&#039; );
	}

	$revisions = wp_get_post_revisions( $post-&gt;ID );

	if ( ! $revisions ) {
		return;
	}

	$rows = &#039;&#039;;
	foreach ( $revisions as $revision ) {
		if ( ! current_user_can( &#039;read_post&#039;, $revision-&gt;ID ) ) {
			continue;
		}

		$is_autosave = wp_is_post_autosave( $revision );
		if ( ( &#039;revision&#039; === $type &amp;&amp; $is_autosave ) || ( &#039;autosave&#039; === $type &amp;&amp; ! $is_autosave ) ) {
			continue;
		}

		$rows .= &quot;\t&lt;li&gt;&quot; . wp_post_revision_title_expanded( $revision ) . &quot;&lt;/li&gt;\n&quot;;
	}

	echo &quot;&lt;div class=&#039;hide-if-js&#039;&gt;&lt;p&gt;&quot; . __( &#039;JavaScript must be enabled to use this feature.&#039; ) . &quot;&lt;/p&gt;&lt;/div&gt;\n&quot;;

	echo &quot;&lt;ul class=&#039;post-revisions hide-if-no-js&#039;&gt;\n&quot;;
	echo $rows;
	echo &#039;&lt;/ul&gt;&#039;;
}

/**
 * Retrieves the parent post object for the given post.
 *
 * @since 5.7.0
 *
 * @param int|WP_Post|null $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return WP_Post|null Parent post object, or null if there isn&#039;t one.
 */
function get_post_parent( $post = null ) {
	$wp_post = get_post( $post );
	return ! empty( $wp_post-&gt;post_parent ) ? get_post( $wp_post-&gt;post_parent ) : null;
}

/**
 * Returns whether the given post has a parent post.
 *
 * @since 5.7.0
 *
 * @param int|WP_Post|null $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return bool Whether the post has a parent post.
 */
function has_post_parent( $post = null ) {
	return (bool) get_post_parent( $post );
}
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