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/**
 * WordPress Rewrite API
 *
 * @package WordPress
 * @subpackage Rewrite
 */

/**
 * Endpoint mask that matches nothing.
 *
 * @since 2.1.0
 */
define( &#039;EP_NONE&#039;, 0 );

/**
 * Endpoint mask that matches post permalinks.
 *
 * @since 2.1.0
 */
define( &#039;EP_PERMALINK&#039;, 1 );

/**
 * Endpoint mask that matches attachment permalinks.
 *
 * @since 2.1.0
 */
define( &#039;EP_ATTACHMENT&#039;, 2 );

/**
 * Endpoint mask that matches any date archives.
 *
 * @since 2.1.0
 */
define( &#039;EP_DATE&#039;, 4 );

/**
 * Endpoint mask that matches yearly archives.
 *
 * @since 2.1.0
 */
define( &#039;EP_YEAR&#039;, 8 );

/**
 * Endpoint mask that matches monthly archives.
 *
 * @since 2.1.0
 */
define( &#039;EP_MONTH&#039;, 16 );

/**
 * Endpoint mask that matches daily archives.
 *
 * @since 2.1.0
 */
define( &#039;EP_DAY&#039;, 32 );

/**
 * Endpoint mask that matches the site root.
 *
 * @since 2.1.0
 */
define( &#039;EP_ROOT&#039;, 64 );

/**
 * Endpoint mask that matches comment feeds.
 *
 * @since 2.1.0
 */
define( &#039;EP_COMMENTS&#039;, 128 );

/**
 * Endpoint mask that matches searches.
 *
 * Note that this only matches a search at a &quot;pretty&quot; URL such as
 * `/search/my-search-term`, not `?s=my-search-term`.
 *
 * @since 2.1.0
 */
define( &#039;EP_SEARCH&#039;, 256 );

/**
 * Endpoint mask that matches category archives.
 *
 * @since 2.1.0
 */
define( &#039;EP_CATEGORIES&#039;, 512 );

/**
 * Endpoint mask that matches tag archives.
 *
 * @since 2.3.0
 */
define( &#039;EP_TAGS&#039;, 1024 );

/**
 * Endpoint mask that matches author archives.
 *
 * @since 2.1.0
 */
define( &#039;EP_AUTHORS&#039;, 2048 );

/**
 * Endpoint mask that matches pages.
 *
 * @since 2.1.0
 */
define( &#039;EP_PAGES&#039;, 4096 );

/**
 * Endpoint mask that matches all archive views.
 *
 * @since 3.7.0
 */
define( &#039;EP_ALL_ARCHIVES&#039;, EP_DATE | EP_YEAR | EP_MONTH | EP_DAY | EP_CATEGORIES | EP_TAGS | EP_AUTHORS );

/**
 * Endpoint mask that matches everything.
 *
 * @since 2.1.0
 */
define( &#039;EP_ALL&#039;, EP_PERMALINK | EP_ATTACHMENT | EP_ROOT | EP_COMMENTS | EP_SEARCH | EP_PAGES | EP_ALL_ARCHIVES );

/**
 * Adds a rewrite rule that transforms a URL structure to a set of query vars.
 *
 * Any value in the $after parameter that isn&#039;t &#039;bottom&#039; will result in the rule
 * being placed at the top of the rewrite rules.
 *
 * @since 2.1.0
 * @since 4.4.0 Array support was added to the `$query` parameter.
 *
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 *
 * @param string       $regex Regular expression to match request against.
 * @param string|array $query The corresponding query vars for this rewrite rule.
 * @param string       $after Optional. Priority of the new rule. Accepts &#039;top&#039;
 *                            or &#039;bottom&#039;. Default &#039;bottom&#039;.
 */
function add_rewrite_rule( $regex, $query, $after = &#039;bottom&#039; ) {
	global $wp_rewrite;

	$wp_rewrite-&gt;add_rule( $regex, $query, $after );
}

/**
 * Adds a new rewrite tag (like %postname%).
 *
 * The `$query` parameter is optional. If it is omitted you must ensure that you call
 * this on, or before, the {@see &#039;init&#039;} hook. This is because `$query` defaults to
 * `$tag=`, and for this to work a new query var has to be added.
 *
 * @since 2.1.0
 *
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 * @global WP         $wp         Current WordPress environment instance.
 *
 * @param string $tag   Name of the new rewrite tag.
 * @param string $regex Regular expression to substitute the tag for in rewrite rules.
 * @param string $query Optional. String to append to the rewritten query. Must end in &#039;=&#039;. Default empty.
 */
function add_rewrite_tag( $tag, $regex, $query = &#039;&#039; ) {
	// Validate the tag&#039;s name.
	if ( strlen( $tag ) &lt; 3 || &#039;%&#039; !== $tag[0] || &#039;%&#039; !== $tag[ strlen( $tag ) - 1 ] ) {
		return;
	}

	global $wp_rewrite, $wp;

	if ( empty( $query ) ) {
		$qv = trim( $tag, &#039;%&#039; );
		$wp-&gt;add_query_var( $qv );
		$query = $qv . &#039;=&#039;;
	}

	$wp_rewrite-&gt;add_rewrite_tag( $tag, $regex, $query );
}

/**
 * Removes an existing rewrite tag (like %postname%).
 *
 * @since 4.5.0
 *
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 *
 * @param string $tag Name of the rewrite tag.
 */
function remove_rewrite_tag( $tag ) {
	global $wp_rewrite;
	$wp_rewrite-&gt;remove_rewrite_tag( $tag );
}

/**
 * Adds a permalink structure.
 *
 * @since 3.0.0
 *
 * @see WP_Rewrite::add_permastruct()
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 *
 * @param string $name   Name for permalink structure.
 * @param string $struct Permalink structure.
 * @param array  $args   Optional. Arguments for building the rules from the permalink structure,
 *                       see WP_Rewrite::add_permastruct() for full details. Default empty array.
 */
function add_permastruct( $name, $struct, $args = array() ) {
	global $wp_rewrite;

	// Back-compat for the old parameters: $with_front and $ep_mask.
	if ( ! is_array( $args ) ) {
		$args = array( &#039;with_front&#039; =&gt; $args );
	}

	if ( func_num_args() === 4 ) {
		$args[&#039;ep_mask&#039;] = func_get_arg( 3 );
	}

	$wp_rewrite-&gt;add_permastruct( $name, $struct, $args );
}

/**
 * Removes a permalink structure.
 *
 * Can only be used to remove permastructs that were added using add_permastruct().
 * Built-in permastructs cannot be removed.
 *
 * @since 4.5.0
 *
 * @see WP_Rewrite::remove_permastruct()
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 *
 * @param string $name Name for permalink structure.
 */
function remove_permastruct( $name ) {
	global $wp_rewrite;

	$wp_rewrite-&gt;remove_permastruct( $name );
}

/**
 * Adds a new feed type like /atom1/.
 *
 * @since 2.1.0
 *
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 *
 * @param string   $feedname Feed name.
 * @param callable $callback Callback to run on feed display.
 * @return string Feed action name.
 */
function add_feed( $feedname, $callback ) {
	global $wp_rewrite;

	if ( ! in_array( $feedname, $wp_rewrite-&gt;feeds, true ) ) {
		$wp_rewrite-&gt;feeds[] = $feedname;
	}

	$hook = &#039;do_feed_&#039; . $feedname;

	// Remove default function hook.
	remove_action( $hook, $hook );

	add_action( $hook, $callback, 10, 2 );

	return $hook;
}

/**
 * Removes rewrite rules and then recreate rewrite rules.
 *
 * @since 3.0.0
 *
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 *
 * @param bool $hard Whether to update .htaccess (hard flush) or just update
 *                   rewrite_rules option (soft flush). Default is true (hard).
 */
function flush_rewrite_rules( $hard = true ) {
	global $wp_rewrite;

	if ( is_callable( array( $wp_rewrite, &#039;flush_rules&#039; ) ) ) {
		$wp_rewrite-&gt;flush_rules( $hard );
	}
}

/**
 * Adds an endpoint, like /trackback/.
 *
 * Adding an endpoint creates extra rewrite rules for each of the matching
 * places specified by the provided bitmask. For example:
 *
 *     add_rewrite_endpoint( &#039;json&#039;, EP_PERMALINK | EP_PAGES );
 *
 * will add a new rewrite rule ending with &quot;json(/(.*))?/?$&quot; for every permastruct
 * that describes a permalink (post) or page. This is rewritten to &quot;json=$match&quot;
 * where $match is the part of the URL matched by the endpoint regex (e.g. &quot;foo&quot; in
 * &quot;[permalink]/json/foo/&quot;).
 *
 * A new query var with the same name as the endpoint will also be created.
 *
 * When specifying $places ensure that you are using the EP_* constants (or a
 * combination of them using the bitwise OR operator) as their values are not
 * guaranteed to remain static (especially `EP_ALL`).
 *
 * Be sure to flush the rewrite rules - see flush_rewrite_rules() - when your plugin gets
 * activated and deactivated.
 *
 * @since 2.1.0
 * @since 4.3.0 Added support for skipping query var registration by passing `false` to `$query_var`.
 *
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 *
 * @param string      $name      Name of the endpoint.
 * @param int         $places    Endpoint mask describing the places the endpoint should be added.
 *                               Accepts a mask of:
 *                               - `EP_ALL`
 *                               - `EP_NONE`
 *                               - `EP_ALL_ARCHIVES`
 *                               - `EP_ATTACHMENT`
 *                               - `EP_AUTHORS`
 *                               - `EP_CATEGORIES`
 *                               - `EP_COMMENTS`
 *                               - `EP_DATE`
 *                               - `EP_DAY`
 *                               - `EP_MONTH`
 *                               - `EP_PAGES`
 *                               - `EP_PERMALINK`
 *                               - `EP_ROOT`
 *                               - `EP_SEARCH`
 *                               - `EP_TAGS`
 *                               - `EP_YEAR`
 * @param string|bool $query_var Name of the corresponding query variable. Pass `false` to skip registering a query_var
 *                               for this endpoint. Defaults to the value of `$name`.
 */
function add_rewrite_endpoint( $name, $places, $query_var = true ) {
	global $wp_rewrite;
	$wp_rewrite-&gt;add_endpoint( $name, $places, $query_var );
}

/**
 * Filters the URL base for taxonomies.
 *
 * To remove any manually prepended /index.php/.
 *
 * @access private
 * @since 2.6.0
 *
 * @param string $base The taxonomy base that we&#039;re going to filter
 * @return string
 */
function _wp_filter_taxonomy_base( $base ) {
	if ( ! empty( $base ) ) {
		$base = preg_replace( &#039;|^/index\.php/|&#039;, &#039;&#039;, $base );
		$base = trim( $base, &#039;/&#039; );
	}
	return $base;
}


/**
 * Resolves numeric slugs that collide with date permalinks.
 *
 * Permalinks of posts with numeric slugs can sometimes look to WP_Query::parse_query()
 * like a date archive, as when your permalink structure is `/%year%/%postname%/` and
 * a post with post_name &#039;05&#039; has the URL `/2015/05/`.
 *
 * This function detects conflicts of this type and resolves them in favor of the
 * post permalink.
 *
 * Note that, since 4.3.0, wp_unique_post_slug() prevents the creation of post slugs
 * that would result in a date archive conflict. The resolution performed in this
 * function is primarily for legacy content, as well as cases when the admin has changed
 * the site&#039;s permalink structure in a way that introduces URL conflicts.
 *
 * @since 4.3.0
 *
 * @param array $query_vars Optional. Query variables for setting up the loop, as determined in
 *                          WP::parse_request(). Default empty array.
 * @return array Returns the original array of query vars, with date/post conflicts resolved.
 */
function wp_resolve_numeric_slug_conflicts( $query_vars = array() ) {
	if ( ! isset( $query_vars[&#039;year&#039;] ) &amp;&amp; ! isset( $query_vars[&#039;monthnum&#039;] ) &amp;&amp; ! isset( $query_vars[&#039;day&#039;] ) ) {
		return $query_vars;
	}

	// Identify the &#039;postname&#039; position in the permastruct array.
	$permastructs   = array_values( array_filter( explode( &#039;/&#039;, get_option( &#039;permalink_structure&#039; ) ) ) );
	$postname_index = array_search( &#039;%postname%&#039;, $permastructs, true );

	if ( false === $postname_index ) {
		return $query_vars;
	}

	/*
	 * A numeric slug could be confused with a year, month, or day, depending on position. To account for
	 * the possibility of post pagination (eg 2015/2 for the second page of a post called &#039;2015&#039;), our
	 * `is_*` checks are generous: check for year-slug clashes when `is_year` *or* `is_month`, and check
	 * for month-slug clashes when `is_month` *or* `is_day`.
	 */
	$compare = &#039;&#039;;
	if ( 0 === $postname_index &amp;&amp; ( isset( $query_vars[&#039;year&#039;] ) || isset( $query_vars[&#039;monthnum&#039;] ) ) ) {
		$compare = &#039;year&#039;;
	} elseif ( $postname_index &amp;&amp; &#039;%year%&#039; === $permastructs[ $postname_index - 1 ] &amp;&amp; ( isset( $query_vars[&#039;monthnum&#039;] ) || isset( $query_vars[&#039;day&#039;] ) ) ) {
		$compare = &#039;monthnum&#039;;
	} elseif ( $postname_index &amp;&amp; &#039;%monthnum%&#039; === $permastructs[ $postname_index - 1 ] &amp;&amp; isset( $query_vars[&#039;day&#039;] ) ) {
		$compare = &#039;day&#039;;
	}

	if ( ! $compare ) {
		return $query_vars;
	}

	// This is the potentially clashing slug.
	$value = &#039;&#039;;
	if ( $compare &amp;&amp; array_key_exists( $compare, $query_vars ) ) {
		$value = $query_vars[ $compare ];
	}

	$post = get_page_by_path( $value, OBJECT, &#039;post&#039; );
	if ( ! ( $post instanceof WP_Post ) ) {
		return $query_vars;
	}

	// If the date of the post doesn&#039;t match the date specified in the URL, resolve to the date archive.
	if ( preg_match( &#039;/^([0-9]{4})\-([0-9]{2})/&#039;, $post-&gt;post_date, $matches ) &amp;&amp; isset( $query_vars[&#039;year&#039;] ) &amp;&amp; ( &#039;monthnum&#039; === $compare || &#039;day&#039; === $compare ) ) {
		// $matches[1] is the year the post was published.
		if ( (int) $query_vars[&#039;year&#039;] !== (int) $matches[1] ) {
			return $query_vars;
		}

		// $matches[2] is the month the post was published.
		if ( &#039;day&#039; === $compare &amp;&amp; isset( $query_vars[&#039;monthnum&#039;] ) &amp;&amp; (int) $query_vars[&#039;monthnum&#039;] !== (int) $matches[2] ) {
			return $query_vars;
		}
	}

	/*
	 * If the located post contains nextpage pagination, then the URL chunk following postname may be
	 * intended as the page number. Verify that it&#039;s a valid page before resolving to it.
	 */
	$maybe_page = &#039;&#039;;
	if ( &#039;year&#039; === $compare &amp;&amp; isset( $query_vars[&#039;monthnum&#039;] ) ) {
		$maybe_page = $query_vars[&#039;monthnum&#039;];
	} elseif ( &#039;monthnum&#039; === $compare &amp;&amp; isset( $query_vars[&#039;day&#039;] ) ) {
		$maybe_page = $query_vars[&#039;day&#039;];
	}
	// Bug found in #11694 - &#039;page&#039; was returning &#039;/4&#039;.
	$maybe_page = (int) trim( $maybe_page, &#039;/&#039; );

	$post_page_count = substr_count( $post-&gt;post_content, &#039;&lt;!--nextpage--&gt;&#039; ) + 1;

	// If the post doesn&#039;t have multiple pages, but a &#039;page&#039; candidate is found, resolve to the date archive.
	if ( 1 === $post_page_count &amp;&amp; $maybe_page ) {
		return $query_vars;
	}

	// If the post has multiple pages and the &#039;page&#039; number isn&#039;t valid, resolve to the date archive.
	if ( $post_page_count &gt; 1 &amp;&amp; $maybe_page &gt; $post_page_count ) {
		return $query_vars;
	}

	// If we&#039;ve gotten to this point, we have a slug/date clash. First, adjust for nextpage.
	if ( &#039;&#039; !== $maybe_page ) {
		$query_vars[&#039;page&#039;] = (int) $maybe_page;
	}

	// Next, unset autodetected date-related query vars.
	unset( $query_vars[&#039;year&#039;] );
	unset( $query_vars[&#039;monthnum&#039;] );
	unset( $query_vars[&#039;day&#039;] );

	// Then, set the identified post.
	$query_vars[&#039;name&#039;] = $post-&gt;post_name;

	// Finally, return the modified query vars.
	return $query_vars;
}

/**
 * Examines a URL and try to determine the post ID it represents.
 *
 * Checks are supposedly from the hosted site blog.
 *
 * @since 1.0.0
 *
 * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 * @global WP         $wp         Current WordPress environment instance.
 *
 * @param string $url Permalink to check.
 * @return int Post ID, or 0 on failure.
 */
function url_to_postid( $url ) {
	global $wp_rewrite;

	/**
	 * Filters the URL to derive the post ID from.
	 *
	 * @since 2.2.0
	 *
	 * @param string $url The URL to derive the post ID from.
	 */
	$url = apply_filters( &#039;url_to_postid&#039;, $url );

	$url_host = parse_url( $url, PHP_URL_HOST );

	if ( is_string( $url_host ) ) {
		$url_host = str_replace( &#039;www.&#039;, &#039;&#039;, $url_host );
	} else {
		$url_host = &#039;&#039;;
	}

	$home_url_host = parse_url( home_url(), PHP_URL_HOST );

	if ( is_string( $home_url_host ) ) {
		$home_url_host = str_replace( &#039;www.&#039;, &#039;&#039;, $home_url_host );
	} else {
		$home_url_host = &#039;&#039;;
	}

	// Bail early if the URL does not belong to this site.
	if ( $url_host &amp;&amp; $url_host !== $home_url_host ) {
		return 0;
	}

	// First, check to see if there is a &#039;p=N&#039; or &#039;page_id=N&#039; to match against.
	if ( preg_match( &#039;#[?&amp;](p|page_id|attachment_id)=(\d+)#&#039;, $url, $values ) ) {
		$id = absint( $values[2] );
		if ( $id ) {
			return $id;
		}
	}

	// Get rid of the #anchor.
	$url_split = explode( &#039;#&#039;, $url );
	$url       = $url_split[0];

	// Get rid of URL ?query=string.
	$url_split = explode( &#039;?&#039;, $url );
	$url       = $url_split[0];

	// Set the correct URL scheme.
	$scheme = parse_url( home_url(), PHP_URL_SCHEME );
	$url    = set_url_scheme( $url, $scheme );

	// Add &#039;www.&#039; if it is absent and should be there.
	if ( str_contains( home_url(), &#039;://www.&#039; ) &amp;&amp; ! str_contains( $url, &#039;://www.&#039; ) ) {
		$url = str_replace( &#039;://&#039;, &#039;://www.&#039;, $url );
	}

	// Strip &#039;www.&#039; if it is present and shouldn&#039;t be.
	if ( ! str_contains( home_url(), &#039;://www.&#039; ) ) {
		$url = str_replace( &#039;://www.&#039;, &#039;://&#039;, $url );
	}

	if ( trim( $url, &#039;/&#039; ) === home_url() &amp;&amp; &#039;page&#039; === get_option( &#039;show_on_front&#039; ) ) {
		$page_on_front = get_option( &#039;page_on_front&#039; );

		if ( $page_on_front &amp;&amp; get_post( $page_on_front ) instanceof WP_Post ) {
			return (int) $page_on_front;
		}
	}

	// Check to see if we are using rewrite rules.
	$rewrite = $wp_rewrite-&gt;wp_rewrite_rules();

	// Not using rewrite rules, and &#039;p=N&#039; and &#039;page_id=N&#039; methods failed, so we&#039;re out of options.
	if ( empty( $rewrite ) ) {
		return 0;
	}

	// Strip &#039;index.php/&#039; if we&#039;re not using path info permalinks.
	if ( ! $wp_rewrite-&gt;using_index_permalinks() ) {
		$url = str_replace( $wp_rewrite-&gt;index . &#039;/&#039;, &#039;&#039;, $url );
	}

	if ( str_contains( trailingslashit( $url ), home_url( &#039;/&#039; ) ) ) {
		// Chop off http://domain.com/[path].
		$url = str_replace( home_url(), &#039;&#039;, $url );
	} else {
		// Chop off /path/to/blog.
		$home_path = parse_url( home_url( &#039;/&#039; ) );
		$home_path = isset( $home_path[&#039;path&#039;] ) ? $home_path[&#039;path&#039;] : &#039;&#039;;
		$url       = preg_replace( sprintf( &#039;#^%s#&#039;, preg_quote( $home_path ) ), &#039;&#039;, trailingslashit( $url ) );
	}

	// Trim leading and lagging slashes.
	$url = trim( $url, &#039;/&#039; );

	$request              = $url;
	$post_type_query_vars = array();

	foreach ( get_post_types( array(), &#039;objects&#039; ) as $post_type =&gt; $t ) {
		if ( ! empty( $t-&gt;query_var ) ) {
			$post_type_query_vars[ $t-&gt;query_var ] = $post_type;
		}
	}

	// Look for matches.
	$request_match = $request;
	foreach ( (array) $rewrite as $match =&gt; $query ) {

		/*
		 * If the requesting file is the anchor of the match,
		 * prepend it to the path info.
		 */
		if ( ! empty( $url ) &amp;&amp; ( $url !== $request ) &amp;&amp; str_starts_with( $match, $url ) ) {
			$request_match = $url . &#039;/&#039; . $request;
		}

		if ( preg_match( &quot;#^$match#&quot;, $request_match, $matches ) ) {

			if ( $wp_rewrite-&gt;use_verbose_page_rules &amp;&amp; preg_match( &#039;/pagename=\$matches\[([0-9]+)\]/&#039;, $query, $varmatch ) ) {
				// This is a verbose page match, let&#039;s check to be sure about it.
				$page = get_page_by_path( $matches[ $varmatch[1] ] );
				if ( ! $page ) {
					continue;
				}

				$post_status_obj = get_post_status_object( $page-&gt;post_status );
				if ( ! $post_status_obj-&gt;public &amp;&amp; ! $post_status_obj-&gt;protected
					&amp;&amp; ! $post_status_obj-&gt;private &amp;&amp; $post_status_obj-&gt;exclude_from_search ) {
					continue;
				}
			}

			/*
			 * Got a match.
			 * Trim the query of everything up to the &#039;?&#039;.
			 */
			$query = preg_replace( &#039;!^.+\?!&#039;, &#039;&#039;, $query );

			// Substitute the substring matches into the query.
			$query = addslashes( WP_MatchesMapRegex::apply( $query, $matches ) );

			// Filter out non-public query vars.
			global $wp;
			parse_str( $query, $query_vars );
			$query = array();
			foreach ( (array) $query_vars as $key =&gt; $value ) {
				if ( in_array( (string) $key, $wp-&gt;public_query_vars, true ) ) {
					$query[ $key ] = $value;
					if ( isset( $post_type_query_vars[ $key ] ) ) {
						$query[&#039;post_type&#039;] = $post_type_query_vars[ $key ];
						$query[&#039;name&#039;]      = $value;
					}
				}
			}

			// Resolve conflicts between posts with numeric slugs and date archive queries.
			$query = wp_resolve_numeric_slug_conflicts( $query );

			// Do the query.
			$query = new WP_Query( $query );
			if ( ! empty( $query-&gt;posts ) &amp;&amp; $query-&gt;is_singular ) {
				return $query-&gt;post-&gt;ID;
			} else {
				return 0;
			}
		}
	}
	return 0;
}
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