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/**
 * API for creating dynamic sidebar without hardcoding functionality into
 * themes. Includes both internal WordPress routines and theme use routines.
 *
 * This functionality was found in a plugin before WordPress 2.2 release which
 * included it in the core from that point on.
 *
 * @link http://codex.wordpress.org/Plugins/WordPress_Widgets WordPress Widgets
 * @link http://codex.wordpress.org/Plugins/WordPress_Widgets_Api Widgets API
 *
 * @package WordPress
 * @subpackage Widgets
 */

/**
 * This class must be extended for each widget and WP_Widget::widget(), WP_Widget::update()
 * and WP_Widget::form() need to be over-ridden.
 *
 * @package WordPress
 * @subpackage Widgets
 * @since 2.8.0
 */
class WP_Widget {

	var $id_base;			// Root id for all widgets of this type.
	var $name;				// Name for this widget type.
	var $widget_options;	// Option array passed to wp_register_sidebar_widget()
	var $control_options;	// Option array passed to wp_register_widget_control()

	var $number = false;	// Unique ID number of the current instance.
	var $id = false;		// Unique ID string of the current instance (id_base-number)
	var $updated = false;	// Set true when we update the data after a POST submit - makes sure we don&#039;t do it twice.

	// Member functions that you must over-ride.

	/** Echo the widget content.
	 *
	 * Subclasses should over-ride this function to generate their widget code.
	 *
	 * @param array $args Display arguments including before_title, after_title, before_widget, and after_widget.
	 * @param array $instance The settings for the particular instance of the widget
	 */
	function widget($args, $instance) {
		die(&#039;function WP_Widget::widget() must be over-ridden in a sub-class.&#039;);
	}

	/** Update a particular instance.
	 *
	 * This function should check that $new_instance is set correctly.
	 * The newly calculated value of $instance should be returned.
	 * If &quot;false&quot; is returned, the instance won&#039;t be saved/updated.
	 *
	 * @param array $new_instance New settings for this instance as input by the user via form()
	 * @param array $old_instance Old settings for this instance
	 * @return array Settings to save or bool false to cancel saving
	 */
	function update($new_instance, $old_instance) {
		return $new_instance;
	}

	/** Echo the settings update form
	 *
	 * @param array $instance Current settings
	 */
	function form($instance) {
		echo &#039;&lt;p class=&quot;no-options-widget&quot;&gt;&#039; . __(&#039;There are no options for this widget.&#039;) . &#039;&lt;/p&gt;&#039;;
		return &#039;noform&#039;;
	}

	// Functions you&#039;ll need to call.

	/**
	 * PHP5 constructor
	 *
	 * @param string $id_base Optional Base ID for the widget, lower case,
	 * if left empty a portion of the widget&#039;s class name will be used. Has to be unique.
	 * @param string $name Name for the widget displayed on the configuration page.
	 * @param array $widget_options Optional Passed to wp_register_sidebar_widget()
	 *	 - description: shown on the configuration page
	 *	 - classname
	 * @param array $control_options Optional Passed to wp_register_widget_control()
	 *	 - width: required if more than 250px
	 *	 - height: currently not used but may be needed in the future
	 */
	function __construct( $id_base, $name, $widget_options = array(), $control_options = array() ) {
		$this-&gt;id_base = empty($id_base) ? preg_replace( &#039;/(wp_)?widget_/&#039;, &#039;&#039;, strtolower(get_class($this)) ) : strtolower($id_base);
		$this-&gt;name = $name;
		$this-&gt;option_name = &#039;widget_&#039; . $this-&gt;id_base;
		$this-&gt;widget_options = wp_parse_args( $widget_options, array(&#039;classname&#039; =&gt; $this-&gt;option_name) );
		$this-&gt;control_options = wp_parse_args( $control_options, array(&#039;id_base&#039; =&gt; $this-&gt;id_base) );
	}

	/**
	 * PHP4 constructor
	 */
	function WP_Widget( $id_base, $name, $widget_options = array(), $control_options = array() ) {
		WP_Widget::__construct( $id_base, $name, $widget_options, $control_options );
	}

	/**
	 * Constructs name attributes for use in form() fields
	 *
	 * This function should be used in form() methods to create name attributes for fields to be saved by update()
	 *
	 * @param string $field_name Field name
	 * @return string Name attribute for $field_name
	 */
	function get_field_name($field_name) {
		return &#039;widget-&#039; . $this-&gt;id_base . &#039;[&#039; . $this-&gt;number . &#039;][&#039; . $field_name . &#039;]&#039;;
	}

	/**
	 * Constructs id attributes for use in form() fields
	 *
	 * This function should be used in form() methods to create id attributes for fields to be saved by update()
	 *
	 * @param string $field_name Field name
	 * @return string ID attribute for $field_name
	 */
	function get_field_id($field_name) {
		return &#039;widget-&#039; . $this-&gt;id_base . &#039;-&#039; . $this-&gt;number . &#039;-&#039; . $field_name;
	}

	// Private Functions. Don&#039;t worry about these.

	function _register() {
		$settings = $this-&gt;get_settings();
		$empty = true;

		if ( is_array($settings) ) {
			foreach ( array_keys($settings) as $number ) {
				if ( is_numeric($number) ) {
					$this-&gt;_set($number);
					$this-&gt;_register_one($number);
					$empty = false;
				}
			}
		}

		if ( $empty ) {
			// If there are none, we register the widget&#039;s existence with a
			// generic template
			$this-&gt;_set(1);
			$this-&gt;_register_one();
		}
	}

	function _set($number) {
		$this-&gt;number = $number;
		$this-&gt;id = $this-&gt;id_base . &#039;-&#039; . $number;
	}

	function _get_display_callback() {
		return array($this, &#039;display_callback&#039;);
	}

	function _get_update_callback() {
		return array($this, &#039;update_callback&#039;);
	}

	function _get_form_callback() {
		return array($this, &#039;form_callback&#039;);
	}

	/**
	 * Determine if we&#039;re in the Customizer; if true, then the object cache gets
	 * suspended and widgets should check this to decide whether they should
	 * store anything persistently to the object cache, to transients, or
	 * anywhere else.
	 *
	 * @since 3.9.0
	 *
	 * @return bool True if Customizer is on, false if not.
	 */
	function is_preview() {
		global $wp_customize;
		return ( isset( $wp_customize ) &amp;&amp; $wp_customize-&gt;is_preview() ) ;
	}

	/** Generate the actual widget content.
	 *	Just finds the instance and calls widget().
	 *	Do NOT over-ride this function. */
	function display_callback( $args, $widget_args = 1 ) {
		if ( is_numeric($widget_args) )
			$widget_args = array( &#039;number&#039; =&gt; $widget_args );

		$widget_args = wp_parse_args( $widget_args, array( &#039;number&#039; =&gt; -1 ) );
		$this-&gt;_set( $widget_args[&#039;number&#039;] );
		$instance = $this-&gt;get_settings();

		if ( array_key_exists( $this-&gt;number, $instance ) ) {
			$instance = $instance[$this-&gt;number];

			/**
			 * Filter the settings for a particular widget instance.
			 *
			 * Returning false will effectively short-circuit display of the widget.
			 *
			 * @since 2.8.0
			 *
			 * @param array     $instance The current widget instance&#039;s settings.
			 * @param WP_Widget $this     The current widget instance.
			 * @param array     $args     An array of default widget arguments.
			 */
			$instance = apply_filters( &#039;widget_display_callback&#039;, $instance, $this, $args );

			if ( false === $instance ) {
				return;
			}

			$was_cache_addition_suspended = wp_suspend_cache_addition();
			if ( $this-&gt;is_preview() &amp;&amp; ! $was_cache_addition_suspended ) {
				wp_suspend_cache_addition( true );
			}

			$this-&gt;widget( $args, $instance );

			if ( $this-&gt;is_preview() ) {
				wp_suspend_cache_addition( $was_cache_addition_suspended );
			}
		}
	}

	/**
	 * Deal with changed settings.
	 *
	 * Do NOT over-ride this function.
	 *
	 * @param mixed $deprecated Not used.
	 */
	function update_callback( $deprecated = 1 ) {
		global $wp_registered_widgets;

		$all_instances = $this-&gt;get_settings();

		// We need to update the data
		if ( $this-&gt;updated )
			return;

		$sidebars_widgets = wp_get_sidebars_widgets();

		if ( isset($_POST[&#039;delete_widget&#039;]) &amp;&amp; $_POST[&#039;delete_widget&#039;] ) {
			// Delete the settings for this instance of the widget
			if ( isset($_POST[&#039;the-widget-id&#039;]) )
				$del_id = $_POST[&#039;the-widget-id&#039;];
			else
				return;

			if ( isset($wp_registered_widgets[$del_id][&#039;params&#039;][0][&#039;number&#039;]) ) {
				$number = $wp_registered_widgets[$del_id][&#039;params&#039;][0][&#039;number&#039;];

				if ( $this-&gt;id_base . &#039;-&#039; . $number == $del_id )
					unset($all_instances[$number]);
			}
		} else {
			if ( isset($_POST[&#039;widget-&#039; . $this-&gt;id_base]) &amp;&amp; is_array($_POST[&#039;widget-&#039; . $this-&gt;id_base]) ) {
				$settings = $_POST[&#039;widget-&#039; . $this-&gt;id_base];
			} elseif ( isset($_POST[&#039;id_base&#039;]) &amp;&amp; $_POST[&#039;id_base&#039;] == $this-&gt;id_base ) {
				$num = $_POST[&#039;multi_number&#039;] ? (int) $_POST[&#039;multi_number&#039;] : (int) $_POST[&#039;widget_number&#039;];
				$settings = array( $num =&gt; array() );
			} else {
				return;
			}

			foreach ( $settings as $number =&gt; $new_instance ) {
				$new_instance = stripslashes_deep($new_instance);
				$this-&gt;_set($number);

				$old_instance = isset($all_instances[$number]) ? $all_instances[$number] : array();

				$was_cache_addition_suspended = wp_suspend_cache_addition();
				if ( $this-&gt;is_preview() &amp;&amp; ! $was_cache_addition_suspended ) {
					wp_suspend_cache_addition( true );
				}

				$instance = $this-&gt;update( $new_instance, $old_instance );

				if ( $this-&gt;is_preview() ) {
					wp_suspend_cache_addition( $was_cache_addition_suspended );
				}

				/**
				 * Filter a widget&#039;s settings before saving.
				 *
				 * Returning false will effectively short-circuit the widget&#039;s ability
				 * to update settings.
				 *
				 * @since 2.8.0
				 *
				 * @param array     $instance     The current widget instance&#039;s settings.
				 * @param array     $new_instance Array of new widget settings.
				 * @param array     $old_instance Array of old widget settings.
				 * @param WP_Widget $this         The current widget instance.
				 */
				$instance = apply_filters( &#039;widget_update_callback&#039;, $instance, $new_instance, $old_instance, $this );
				if ( false !== $instance ) {
					$all_instances[$number] = $instance;
				}

				break; // run only once
			}
		}

		$this-&gt;save_settings($all_instances);
		$this-&gt;updated = true;
	}

	/**
	 * Generate the control form.
	 *
	 * Do NOT over-ride this function.
	 */
	function form_callback( $widget_args = 1 ) {
		if ( is_numeric($widget_args) )
			$widget_args = array( &#039;number&#039; =&gt; $widget_args );

		$widget_args = wp_parse_args( $widget_args, array( &#039;number&#039; =&gt; -1 ) );
		$all_instances = $this-&gt;get_settings();

		if ( -1 == $widget_args[&#039;number&#039;] ) {
			// We echo out a form where &#039;number&#039; can be set later
			$this-&gt;_set(&#039;__i__&#039;);
			$instance = array();
		} else {
			$this-&gt;_set($widget_args[&#039;number&#039;]);
			$instance = $all_instances[ $widget_args[&#039;number&#039;] ];
		}

		/**
		 * Filter the widget instance&#039;s settings before displaying the control form.
		 *
		 * Returning false effectively short-circuits display of the control form.
		 *
		 * @since 2.8.0
		 *
		 * @param array     $instance The current widget instance&#039;s settings.
		 * @param WP_Widget $this     The current widget instance.
		 */
		$instance = apply_filters( &#039;widget_form_callback&#039;, $instance, $this );

		$return = null;
		if ( false !== $instance ) {
			$return = $this-&gt;form($instance);

			/**
			 * Fires at the end of the widget control form.
			 *
			 * Use this hook to add extra fields to the widget form. The hook
			 * is only fired if the value passed to the &#039;widget_form_callback&#039;
			 * hook is not false.
			 *
			 * Note: If the widget has no form, the text echoed from the default
			 * form method can be hidden using CSS.
			 *
			 * @since 2.8.0
			 *
			 * @param WP_Widget $this     The widget instance, passed by reference.
			 * @param null      $return   Return null if new fields are added.
			 * @param array     $instance An array of the widget&#039;s settings.
			 */
			do_action_ref_array( &#039;in_widget_form&#039;, array( &amp;$this, &amp;$return, $instance ) );
		}
		return $return;
	}

	/** Helper function: Registers a single instance. */
	function _register_one($number = -1) {
		wp_register_sidebar_widget(	$this-&gt;id, $this-&gt;name,	$this-&gt;_get_display_callback(), $this-&gt;widget_options, array( &#039;number&#039; =&gt; $number ) );
		_register_widget_update_callback( $this-&gt;id_base, $this-&gt;_get_update_callback(), $this-&gt;control_options, array( &#039;number&#039; =&gt; -1 ) );
		_register_widget_form_callback(	$this-&gt;id, $this-&gt;name,	$this-&gt;_get_form_callback(), $this-&gt;control_options, array( &#039;number&#039; =&gt; $number ) );
	}

	function save_settings($settings) {
		$settings[&#039;_multiwidget&#039;] = 1;
		update_option( $this-&gt;option_name, $settings );
	}

	function get_settings() {
		$settings = get_option($this-&gt;option_name);

		if ( false === $settings &amp;&amp; isset($this-&gt;alt_option_name) )
			$settings = get_option($this-&gt;alt_option_name);

		if ( !is_array($settings) )
			$settings = array();

		if ( !empty($settings) &amp;&amp; !array_key_exists(&#039;_multiwidget&#039;, $settings) ) {
			// old format, convert if single widget
			$settings = wp_convert_widget_settings($this-&gt;id_base, $this-&gt;option_name, $settings);
		}

		unset($settings[&#039;_multiwidget&#039;], $settings[&#039;__i__&#039;]);
		return $settings;
	}
}

/**
 * Singleton that registers and instantiates WP_Widget classes.
 *
 * @package WordPress
 * @subpackage Widgets
 * @since 2.8.0
 */
class WP_Widget_Factory {
	var $widgets = array();

	function WP_Widget_Factory() {
		add_action( &#039;widgets_init&#039;, array( $this, &#039;_register_widgets&#039; ), 100 );
	}

	function register($widget_class) {
		$this-&gt;widgets[$widget_class] = new $widget_class();
	}

	function unregister($widget_class) {
		if ( isset($this-&gt;widgets[$widget_class]) )
			unset($this-&gt;widgets[$widget_class]);
	}

	function _register_widgets() {
		global $wp_registered_widgets;
		$keys = array_keys($this-&gt;widgets);
		$registered = array_keys($wp_registered_widgets);
		$registered = array_map(&#039;_get_widget_id_base&#039;, $registered);

		foreach ( $keys as $key ) {
			// don&#039;t register new widget if old widget with the same id is already registered
			if ( in_array($this-&gt;widgets[$key]-&gt;id_base, $registered, true) ) {
				unset($this-&gt;widgets[$key]);
				continue;
			}

			$this-&gt;widgets[$key]-&gt;_register();
		}
	}
}

/* Global Variables */

/** @ignore */
global $wp_registered_sidebars, $wp_registered_widgets, $wp_registered_widget_controls, $wp_registered_widget_updates;

/**
 * Stores the sidebars, since many themes can have more than one.
 *
 * @global array $wp_registered_sidebars
 * @since 2.2.0
 */
$wp_registered_sidebars = array();

/**
 * Stores the registered widgets.
 *
 * @global array $wp_registered_widgets
 * @since 2.2.0
 */
$wp_registered_widgets = array();

/**
 * Stores the registered widget control (options).
 *
 * @global array $wp_registered_widget_controls
 * @since 2.2.0
 */
$wp_registered_widget_controls = array();
$wp_registered_widget_updates = array();

/**
 * Private
 */
$_wp_sidebars_widgets = array();

/**
 * Private
 */
$GLOBALS[&#039;_wp_deprecated_widgets_callbacks&#039;] = array(
	&#039;wp_widget_pages&#039;,
	&#039;wp_widget_pages_control&#039;,
	&#039;wp_widget_calendar&#039;,
	&#039;wp_widget_calendar_control&#039;,
	&#039;wp_widget_archives&#039;,
	&#039;wp_widget_archives_control&#039;,
	&#039;wp_widget_links&#039;,
	&#039;wp_widget_meta&#039;,
	&#039;wp_widget_meta_control&#039;,
	&#039;wp_widget_search&#039;,
	&#039;wp_widget_recent_entries&#039;,
	&#039;wp_widget_recent_entries_control&#039;,
	&#039;wp_widget_tag_cloud&#039;,
	&#039;wp_widget_tag_cloud_control&#039;,
	&#039;wp_widget_categories&#039;,
	&#039;wp_widget_categories_control&#039;,
	&#039;wp_widget_text&#039;,
	&#039;wp_widget_text_control&#039;,
	&#039;wp_widget_rss&#039;,
	&#039;wp_widget_rss_control&#039;,
	&#039;wp_widget_recent_comments&#039;,
	&#039;wp_widget_recent_comments_control&#039;
);

/* Template tags &amp; API functions */

/**
 * Register a widget
 *
 * Registers a WP_Widget widget
 *
 * @since 2.8.0
 *
 * @see WP_Widget
 * @see WP_Widget_Factory
 * @uses WP_Widget_Factory
 *
 * @param string $widget_class The name of a class that extends WP_Widget
 */
function register_widget($widget_class) {
	global $wp_widget_factory;

	$wp_widget_factory-&gt;register($widget_class);
}

/**
 * Unregister a widget
 *
 * Unregisters a WP_Widget widget. Useful for unregistering default widgets.
 * Run within a function hooked to the widgets_init action.
 *
 * @since 2.8.0
 *
 * @see WP_Widget
 * @see WP_Widget_Factory
 * @uses WP_Widget_Factory
 *
 * @param string $widget_class The name of a class that extends WP_Widget
 */
function unregister_widget($widget_class) {
	global $wp_widget_factory;

	$wp_widget_factory-&gt;unregister($widget_class);
}

/**
 * Creates multiple sidebars.
 *
 * If you wanted to quickly create multiple sidebars for a theme or internally.
 * This function will allow you to do so. If you don&#039;t pass the &#039;name&#039; and/or
 * &#039;id&#039; in $args, then they will be built for you.
 *
 * The default for the name is &quot;Sidebar #&quot;, with &#039;#&#039; being replaced with the
 * number the sidebar is currently when greater than one. If first sidebar, the
 * name will be just &quot;Sidebar&quot;. The default for id is &quot;sidebar-&quot; followed by the
 * number the sidebar creation is currently at. If the id is provided, and multiple
 * sidebars are being defined, the id will have &quot;-2&quot; appended, and so on.
 *
 * @since 2.2.0
 *
 * @see register_sidebar() The second parameter is documented by register_sidebar() and is the same here.
 * @uses parse_str() Converts a string to an array to be used in the rest of the function.
 * @uses register_sidebar() Sends single sidebar information [name, id] to this
 *	function to handle building the sidebar.
 *
 * @param int $number Number of sidebars to create.
 * @param string|array $args Builds Sidebar based off of &#039;name&#039; and &#039;id&#039; values.
 */
function register_sidebars($number = 1, $args = array()) {
	global $wp_registered_sidebars;
	$number = (int) $number;

	if ( is_string($args) )
		parse_str($args, $args);

	for ( $i = 1; $i &lt;= $number; $i++ ) {
		$_args = $args;

		if ( $number &gt; 1 )
			$_args[&#039;name&#039;] = isset($args[&#039;name&#039;]) ? sprintf($args[&#039;name&#039;], $i) : sprintf(__(&#039;Sidebar %d&#039;), $i);
		else
			$_args[&#039;name&#039;] = isset($args[&#039;name&#039;]) ? $args[&#039;name&#039;] : __(&#039;Sidebar&#039;);

		// Custom specified ID&#039;s are suffixed if they exist already.
		// Automatically generated sidebar names need to be suffixed regardless starting at -0
		if ( isset($args[&#039;id&#039;]) ) {
			$_args[&#039;id&#039;] = $args[&#039;id&#039;];
			$n = 2; // Start at -2 for conflicting custom ID&#039;s
			while ( isset($wp_registered_sidebars[$_args[&#039;id&#039;]]) )
				$_args[&#039;id&#039;] = $args[&#039;id&#039;] . &#039;-&#039; . $n++;
		} else {
			$n = count($wp_registered_sidebars);
			do {
				$_args[&#039;id&#039;] = &#039;sidebar-&#039; . ++$n;
			} while ( isset($wp_registered_sidebars[$_args[&#039;id&#039;]]) );
		}
		register_sidebar($_args);
	}
}

/**
 * Builds the definition for a single sidebar and returns the ID.
 *
 * Accepts either a string or an array and then parses that against a set
 * of default arguments for the new sidebar. WordPress will automatically
 * generate a sidebar ID and name based on the current number of registered
 * sidebars if those arguments are not included.
 *
 * When allowing for automatic generation of the name and ID parameters, keep
 * in mind that the incrementor for your sidebar can change over time depending
 * on what other plugins and themes are installed.
 *
 * If theme support for &#039;widgets&#039; has not yet been added when this function is
 * called, it will be automatically enabled through the use of add_theme_support()
 *
 * Arguments passed as a string should be separated by &#039;&amp;&#039;:
 *
 *     e.g. &#039;name=Sidebar&amp;id=my_prefix_sidebar&#039;
 *
 * The same arguments passed as an array:
 *
 *     array(
 *         &#039;name&#039; =&gt; &#039;Sidebar&#039;,
 *         &#039;id&#039;   =&gt; &#039;my_prefix_sidebar&#039;,
 *     )
 *
 * Arguments:
 *     name          - The name or title of the sidebar displayed in the admin dashboard.
 *     id            - The unique identifier by which the sidebar will be called.
 *     before_widget - HTML content that will be prepended to each widget&#039;s HTML output
 *                     when assigned to this sidebar.
 *     after_widget  - HTML content that will be appended to each widget&#039;s HTML output
 *                     when assigned to this sidebar.
 *     before_title  - HTML content that will be prepended to the sidebar title when displayed.
 *     after_title   - HTML content that will be appended to the sidebar title when displayed.
 *
 * @since 2.2.0
 * @uses $wp_registered_sidebars Stores the new sidebar in this array by sidebar ID.
 * @uses add_theme_support() to ensure widget support has been added.
 *
 * @param string|array $args Arguments for the sidebar being registered.
 * @return string Sidebar ID added to $wp_registered_sidebars global.
 */
function register_sidebar($args = array()) {
	global $wp_registered_sidebars;

	$i = count($wp_registered_sidebars) + 1;

	$defaults = array(
		&#039;name&#039; =&gt; sprintf(__(&#039;Sidebar %d&#039;), $i ),
		&#039;id&#039; =&gt; &quot;sidebar-$i&quot;,
		&#039;description&#039; =&gt; &#039;&#039;,
		&#039;class&#039; =&gt; &#039;&#039;,
		&#039;before_widget&#039; =&gt; &#039;&lt;li id=&quot;%1$s&quot; class=&quot;widget %2$s&quot;&gt;&#039;,
		&#039;after_widget&#039; =&gt; &quot;&lt;/li&gt;\n&quot;,
		&#039;before_title&#039; =&gt; &#039;&lt;h2 class=&quot;widgettitle&quot;&gt;&#039;,
		&#039;after_title&#039; =&gt; &quot;&lt;/h2&gt;\n&quot;,
	);

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

	$wp_registered_sidebars[$sidebar[&#039;id&#039;]] = $sidebar;

	add_theme_support(&#039;widgets&#039;);

	/**
	 * Fires once a sidebar has been registered.
	 *
	 * @since 3.0.0
	 *
	 * @param array $sidebar Parsed arguments for the registered sidebar.
	 */
	do_action( &#039;register_sidebar&#039;, $sidebar );

	return $sidebar[&#039;id&#039;];
}

/**
 * Removes a sidebar from the list.
 *
 * @since 2.2.0
 *
 * @uses $wp_registered_sidebars Stores the new sidebar in this array by sidebar ID.
 *
 * @param string $name The ID of the sidebar when it was added.
 */
function unregister_sidebar( $name ) {
	global $wp_registered_sidebars;

	if ( isset( $wp_registered_sidebars[$name] ) )
		unset( $wp_registered_sidebars[$name] );
}

/**
 * Register widget for use in sidebars.
 *
 * The default widget option is &#039;classname&#039; that can be override.
 *
 * The function can also be used to unregister widgets when $output_callback
 * parameter is an empty string.
 *
 * @since 2.2.0
 *
 * @uses $wp_registered_widgets Uses stored registered widgets.
 * @uses $wp_register_widget_defaults Retrieves widget defaults.
 *
 * @param int|string $id Widget ID.
 * @param string $name Widget display title.
 * @param callback $output_callback Run when widget is called.
 * @param array|string $options Optional. Widget Options.
 * @param mixed $params,... Widget parameters to add to widget.
 * @return null Will return if $output_callback is empty after removing widget.
 */
function wp_register_sidebar_widget($id, $name, $output_callback, $options = array()) {
	global $wp_registered_widgets, $wp_registered_widget_controls, $wp_registered_widget_updates, $_wp_deprecated_widgets_callbacks;

	$id = strtolower($id);

	if ( empty($output_callback) ) {
		unset($wp_registered_widgets[$id]);
		return;
	}

	$id_base = _get_widget_id_base($id);
	if ( in_array($output_callback, $_wp_deprecated_widgets_callbacks, true) &amp;&amp; !is_callable($output_callback) ) {
		if ( isset($wp_registered_widget_controls[$id]) )
			unset($wp_registered_widget_controls[$id]);

		if ( isset($wp_registered_widget_updates[$id_base]) )
			unset($wp_registered_widget_updates[$id_base]);

		return;
	}

	$defaults = array(&#039;classname&#039; =&gt; $output_callback);
	$options = wp_parse_args($options, $defaults);
	$widget = array(
		&#039;name&#039; =&gt; $name,
		&#039;id&#039; =&gt; $id,
		&#039;callback&#039; =&gt; $output_callback,
		&#039;params&#039; =&gt; array_slice(func_get_args(), 4)
	);
	$widget = array_merge($widget, $options);

	if ( is_callable($output_callback) &amp;&amp; ( !isset($wp_registered_widgets[$id]) || did_action( &#039;widgets_init&#039; ) ) ) {

		/**
		 * Fires once for each registered widget.
		 *
		 * @since 3.0.0
		 *
		 * @param array $widget An array of default widget arguments.
		 */
		do_action( &#039;wp_register_sidebar_widget&#039;, $widget );
		$wp_registered_widgets[$id] = $widget;
	}
}

/**
 * Retrieve description for widget.
 *
 * When registering widgets, the options can also include &#039;description&#039; that
 * describes the widget for display on the widget administration panel or
 * in the theme.
 *
 * @since 2.5.0
 *
 * @param int|string $id Widget ID.
 * @return string Widget description, if available. Null on failure to retrieve description.
 */
function wp_widget_description( $id ) {
	if ( !is_scalar($id) )
		return;

	global $wp_registered_widgets;

	if ( isset($wp_registered_widgets[$id][&#039;description&#039;]) )
		return esc_html( $wp_registered_widgets[$id][&#039;description&#039;] );
}

/**
 * Retrieve description for a sidebar.
 *
 * When registering sidebars a &#039;description&#039; parameter can be included that
 * describes the sidebar for display on the widget administration panel.
 *
 * @since 2.9.0
 *
 * @param int|string $id sidebar ID.
 * @return string Sidebar description, if available. Null on failure to retrieve description.
 */
function wp_sidebar_description( $id ) {
	if ( !is_scalar($id) )
		return;

	global $wp_registered_sidebars;

	if ( isset($wp_registered_sidebars[$id][&#039;description&#039;]) )
		return esc_html( $wp_registered_sidebars[$id][&#039;description&#039;] );
}

/**
 * Remove widget from sidebar.
 *
 * @since 2.2.0
 *
 * @param int|string $id Widget ID.
 */
function wp_unregister_sidebar_widget($id) {

	/**
	 * Fires just before a widget is removed from a sidebar.
	 *
	 * @since 3.0.0
	 *
	 * @param int $id The widget ID.
	 */
	do_action( &#039;wp_unregister_sidebar_widget&#039;, $id );

	wp_register_sidebar_widget($id, &#039;&#039;, &#039;&#039;);
	wp_unregister_widget_control($id);
}

/**
 * Registers widget control callback for customizing options.
 *
 * The options contains the &#039;height&#039;, &#039;width&#039;, and &#039;id_base&#039; keys. The &#039;height&#039;
 * option is never used. The &#039;width&#039; option is the width of the fully expanded
 * control form, but try hard to use the default width. The &#039;id_base&#039; is for
 * multi-widgets (widgets which allow multiple instances such as the text
 * widget), an id_base must be provided. The widget id will end up looking like
 * {$id_base}-{$unique_number}.
 *
 * @since 2.2.0
 *
 * @param int|string $id Sidebar ID.
 * @param string $name Sidebar display name.
 * @param callback $control_callback Run when sidebar is displayed.
 * @param array|string $options Optional. Widget options. See above long description.
 * @param mixed $params,... Optional. Additional parameters to add to widget.
 */
function wp_register_widget_control($id, $name, $control_callback, $options = array()) {
	global $wp_registered_widget_controls, $wp_registered_widget_updates, $wp_registered_widgets, $_wp_deprecated_widgets_callbacks;

	$id = strtolower($id);
	$id_base = _get_widget_id_base($id);

	if ( empty($control_callback) ) {
		unset($wp_registered_widget_controls[$id]);
		unset($wp_registered_widget_updates[$id_base]);
		return;
	}

	if ( in_array($control_callback, $_wp_deprecated_widgets_callbacks, true) &amp;&amp; !is_callable($control_callback) ) {
		if ( isset($wp_registered_widgets[$id]) )
			unset($wp_registered_widgets[$id]);

		return;
	}

	if ( isset($wp_registered_widget_controls[$id]) &amp;&amp; !did_action( &#039;widgets_init&#039; ) )
		return;

	$defaults = array(&#039;width&#039; =&gt; 250, &#039;height&#039; =&gt; 200 ); // height is never used
	$options = wp_parse_args($options, $defaults);
	$options[&#039;width&#039;] = (int) $options[&#039;width&#039;];
	$options[&#039;height&#039;] = (int) $options[&#039;height&#039;];

	$widget = array(
		&#039;name&#039; =&gt; $name,
		&#039;id&#039; =&gt; $id,
		&#039;callback&#039; =&gt; $control_callback,
		&#039;params&#039; =&gt; array_slice(func_get_args(), 4)
	);
	$widget = array_merge($widget, $options);

	$wp_registered_widget_controls[$id] = $widget;

	if ( isset($wp_registered_widget_updates[$id_base]) )
		return;

	if ( isset($widget[&#039;params&#039;][0][&#039;number&#039;]) )
		$widget[&#039;params&#039;][0][&#039;number&#039;] = -1;

	unset($widget[&#039;width&#039;], $widget[&#039;height&#039;], $widget[&#039;name&#039;], $widget[&#039;id&#039;]);
	$wp_registered_widget_updates[$id_base] = $widget;
}

function _register_widget_update_callback($id_base, $update_callback, $options = array()) {
	global $wp_registered_widget_updates;

	if ( isset($wp_registered_widget_updates[$id_base]) ) {
		if ( empty($update_callback) )
			unset($wp_registered_widget_updates[$id_base]);
		return;
	}

	$widget = array(
		&#039;callback&#039; =&gt; $update_callback,
		&#039;params&#039; =&gt; array_slice(func_get_args(), 3)
	);

	$widget = array_merge($widget, $options);
	$wp_registered_widget_updates[$id_base] = $widget;
}

function _register_widget_form_callback($id, $name, $form_callback, $options = array()) {
	global $wp_registered_widget_controls;

	$id = strtolower($id);

	if ( empty($form_callback) ) {
		unset($wp_registered_widget_controls[$id]);
		return;
	}

	if ( isset($wp_registered_widget_controls[$id]) &amp;&amp; !did_action( &#039;widgets_init&#039; ) )
		return;

	$defaults = array(&#039;width&#039; =&gt; 250, &#039;height&#039; =&gt; 200 );
	$options = wp_parse_args($options, $defaults);
	$options[&#039;width&#039;] = (int) $options[&#039;width&#039;];
	$options[&#039;height&#039;] = (int) $options[&#039;height&#039;];

	$widget = array(
		&#039;name&#039; =&gt; $name,
		&#039;id&#039; =&gt; $id,
		&#039;callback&#039; =&gt; $form_callback,
		&#039;params&#039; =&gt; array_slice(func_get_args(), 4)
	);
	$widget = array_merge($widget, $options);

	$wp_registered_widget_controls[$id] = $widget;
}

/**
 * Remove control callback for widget.
 *
 * @since 2.2.0
 * @uses wp_register_widget_control() Unregisters by using empty callback.
 *
 * @param int|string $id Widget ID.
 */
function wp_unregister_widget_control($id) {
	return wp_register_widget_control($id, &#039;&#039;, &#039;&#039;);
}

/**
 * Display dynamic sidebar.
 *
 * By default this displays the default sidebar or &#039;sidebar-1&#039;. If your theme specifies the &#039;id&#039; or
 * &#039;name&#039; parameter for its registered sidebars you can pass an id or name as the $index parameter.
 * Otherwise, you can pass in a numerical index to display the sidebar at that index.
 *
 * @since 2.2.0
 *
 * @param int|string $index Optional, default is 1. Index, name or ID of dynamic sidebar.
 * @return bool True, if widget sidebar was found and called. False if not found or not called.
 */
function dynamic_sidebar($index = 1) {
	global $wp_registered_sidebars, $wp_registered_widgets;

	if ( is_int($index) ) {
		$index = &quot;sidebar-$index&quot;;
	} else {
		$index = sanitize_title($index);
		foreach ( (array) $wp_registered_sidebars as $key =&gt; $value ) {
			if ( sanitize_title($value[&#039;name&#039;]) == $index ) {
				$index = $key;
				break;
			}
		}
	}

	$sidebars_widgets = wp_get_sidebars_widgets();
	if ( empty( $wp_registered_sidebars[ $index ] ) || empty( $sidebars_widgets[ $index ] ) || ! is_array( $sidebars_widgets[ $index ] ) ) {
		/** This action is documented in wp-includes/widgets.php */
		do_action( &#039;dynamic_sidebar_before&#039;, $index, false );
		/** This action is documented in wp-includes/widgets.php */
		do_action( &#039;dynamic_sidebar_after&#039;,  $index, false );
		/** This filter is documented in wp-includes/widgets.php */
		return apply_filters( &#039;dynamic_sidebar_has_widgets&#039;, false, $index );
	}

	/**
	 * Fires before widgets are rendered in a dynamic sidebar.
	 *
	 * Note: The action also fires for empty sidebars, and on both the front-end
	 * and back-end, including the Inactive Widgets sidebar on the Widgets screen.
	 *
	 * @since 3.9.0
	 *
	 * @param int|string $index       Index, name, or ID of the dynamic sidebar.
	 * @param bool       $has_widgets Whether the sidebar is populated with widgets.
	 *                                Default true.
	 */
	do_action( &#039;dynamic_sidebar_before&#039;, $index, true );
	$sidebar = $wp_registered_sidebars[$index];

	$did_one = false;
	foreach ( (array) $sidebars_widgets[$index] as $id ) {

		if ( !isset($wp_registered_widgets[$id]) ) continue;

		$params = array_merge(
			array( array_merge( $sidebar, array(&#039;widget_id&#039; =&gt; $id, &#039;widget_name&#039; =&gt; $wp_registered_widgets[$id][&#039;name&#039;]) ) ),
			(array) $wp_registered_widgets[$id][&#039;params&#039;]
		);

		// Substitute HTML id and class attributes into before_widget
		$classname_ = &#039;&#039;;
		foreach ( (array) $wp_registered_widgets[$id][&#039;classname&#039;] as $cn ) {
			if ( is_string($cn) )
				$classname_ .= &#039;_&#039; . $cn;
			elseif ( is_object($cn) )
				$classname_ .= &#039;_&#039; . get_class($cn);
		}
		$classname_ = ltrim($classname_, &#039;_&#039;);
		$params[0][&#039;before_widget&#039;] = sprintf($params[0][&#039;before_widget&#039;], $id, $classname_);

		/**
		 * Filter the parameters passed to a widget&#039;s display callback.
		 *
		 * Note: The filter is evaluated on both the front-end and back-end,
		 * including for the Inactive Widgets sidebar on the Widgets screen.
		 *
		 * @since 2.5.0
		 *
		 * @see register_sidebar()
		 *
		 * @param array $params {
		 *     @type array $args  {
		 *         An array of widget display arguments.
		 *
		 *         @type string $name          Name of the sidebar the widget is assigned to.
		 *         @type string $id            ID of the sidebar the widget is assigned to.
		 *         @type string $description   The sidebar description.
		 *         @type string $class         CSS class applied to the sidebar container.
		 *         @type string $before_widget HTML markup to prepend to each widget in the sidebar.
		 *         @type string $after_widget  HTML markup to append to each widget in the sidebar.
		 *         @type string $before_title  HTML markup to prepend to the widget title when displayed.
		 *         @type string $after_title   HTML markup to append to the widget title when displayed.
		 *         @type string $widget_id     ID of the widget.
		 *         @type string $widget_name   Name of the widget.
		 *     }
		 *     @type array $widget_args {
		 *         An array of multi-widget arguments.
		 *
		 *         @type int $number Number increment used for multiples of the same widget.
		 *     }
		 * }
		 */
		$params = apply_filters( &#039;dynamic_sidebar_params&#039;, $params );

		$callback = $wp_registered_widgets[$id][&#039;callback&#039;];

		/**
		 * Fires before a widget&#039;s display callback is called.
		 *
		 * Note: The action fires on both the front-end and back-end, including
		 * for widgets in the Inactive Widgets sidebar on the Widgets screen.
		 *
		 * The action is not fired for empty sidebars.
		 *
		 * @since 3.0.0
		 *
		 * @param array $widget_id {
		 *     An associative array of widget arguments.
		 *
		 *     @type string $name                Name of the widget.
		 *     @type string $id                  Widget ID.
		 *     @type array|callback $callback    When the hook is fired on the front-end, $callback is an array
		 *                                       containing the widget object. Fired on the back-end, $callback
		 *                                       is &#039;wp_widget_control&#039;, see $_callback.
		 *     @type array          $params      An associative array of multi-widget arguments.
		 *     @type string         $classname   CSS class applied to the widget container.
		 *     @type string         $description The widget description.
		 *     @type array          $_callback   When the hook is fired on the back-end, $_callback is populated
		 *                                       with an array containing the widget object, see $callback.
		 * }
		 */
		do_action( &#039;dynamic_sidebar&#039;, $wp_registered_widgets[ $id ] );

		if ( is_callable($callback) ) {
			call_user_func_array($callback, $params);
			$did_one = true;
		}
	}

	/**
	 * Fires after widgets are rendered in a dynamic sidebar.
	 *
	 * Note: The action also fires for empty sidebars, and on both the front-end
	 * and back-end, including the Inactive Widgets sidebar on the Widgets screen.
	 *
	 * @since 3.9.0
	 *
	 * @param int|string $index       Index, name, or ID of the dynamic sidebar.
	 * @param bool       $has_widgets Whether the sidebar is populated with widgets.
	 *                                Default true.
	 */
	do_action( &#039;dynamic_sidebar_after&#039;, $index, true );

	/**
	 * Filter whether a sidebar has widgets.
	 *
	 * Note: The filter is also evaluated for empty sidebars, and on both the front-end
	 * and back-end, including the Inactive Widgets sidebar on the Widgets screen.
	 *
	 * @since 3.9.0
	 *
	 * @param bool       $did_one Whether at least one widget was rendered in the sidebar.
	 *                            Default false.
	 * @param int|string $index   Index, name, or ID of the dynamic sidebar.
	 */

	$did_one = apply_filters( &#039;dynamic_sidebar_has_widgets&#039;, $did_one, $index );

	return $did_one;
}

/**
 * Whether widget is displayed on the front-end.
 *
 * Either $callback or $id_base can be used
 * $id_base is the first argument when extending WP_Widget class
 * Without the optional $widget_id parameter, returns the ID of the first sidebar
 * in which the first instance of the widget with the given callback or $id_base is found.
 * With the $widget_id parameter, returns the ID of the sidebar where
 * the widget with that callback/$id_base AND that ID is found.
 *
 * NOTE: $widget_id and $id_base are the same for single widgets. To be effective
 * this function has to run after widgets have initialized, at action &#039;init&#039; or later.
 *
 * @since 2.2.0
 *
 * @param string $callback Optional, Widget callback to check.
 * @param int $widget_id Optional, but needed for checking. Widget ID.
 * @param string $id_base Optional, the base ID of a widget created by extending WP_Widget.
 * @param bool $skip_inactive Optional, whether to check in &#039;wp_inactive_widgets&#039;.
 * @return mixed false if widget is not active or id of sidebar in which the widget is active.
 */
function is_active_widget($callback = false, $widget_id = false, $id_base = false, $skip_inactive = true) {
	global $wp_registered_widgets;

	$sidebars_widgets = wp_get_sidebars_widgets();

	if ( is_array($sidebars_widgets) ) {
		foreach ( $sidebars_widgets as $sidebar =&gt; $widgets ) {
			if ( $skip_inactive &amp;&amp; &#039;wp_inactive_widgets&#039; == $sidebar )
				continue;

			if ( is_array($widgets) ) {
				foreach ( $widgets as $widget ) {
					if ( ( $callback &amp;&amp; isset($wp_registered_widgets[$widget][&#039;callback&#039;]) &amp;&amp; $wp_registered_widgets[$widget][&#039;callback&#039;] == $callback ) || ( $id_base &amp;&amp; _get_widget_id_base($widget) == $id_base ) ) {
						if ( !$widget_id || $widget_id == $wp_registered_widgets[$widget][&#039;id&#039;] )
							return $sidebar;
					}
				}
			}
		}
	}
	return false;
}

/**
 * Whether the dynamic sidebar is enabled and used by theme.
 *
 * @since 2.2.0
 *
 * @return bool True, if using widgets. False, if not using widgets.
 */
function is_dynamic_sidebar() {
	global $wp_registered_widgets, $wp_registered_sidebars;
	$sidebars_widgets = get_option(&#039;sidebars_widgets&#039;);
	foreach ( (array) $wp_registered_sidebars as $index =&gt; $sidebar ) {
		if ( count($sidebars_widgets[$index]) ) {
			foreach ( (array) $sidebars_widgets[$index] as $widget )
				if ( array_key_exists($widget, $wp_registered_widgets) )
					return true;
		}
	}
	return false;
}

/**
 * Whether a sidebar is in use.
 *
 * @since 2.8.0
 *
 * @param mixed $index Sidebar name, id or number to check.
 * @return bool true if the sidebar is in use, false otherwise.
 */
function is_active_sidebar( $index ) {
	$index = ( is_int($index) ) ? &quot;sidebar-$index&quot; : sanitize_title($index);
	$sidebars_widgets = wp_get_sidebars_widgets();
	$is_active_sidebar = ! empty( $sidebars_widgets[$index] );

	/**
	 * Filter whether a dynamic sidebar is considered &quot;active&quot;.
	 *
	 * @since 3.9.0
	 *
	 * @param bool       $is_active_sidebar Whether or not the sidebar should be considered &quot;active&quot;.
	 *                                      In other words, whether the sidebar contains any widgets.
	 * @param int|string $index             Index, name, or ID of the dynamic sidebar.
	 */
	return apply_filters( &#039;is_active_sidebar&#039;, $is_active_sidebar, $index );
}

/* Internal Functions */

/**
 * Retrieve full list of sidebars and their widgets.
 *
 * Will upgrade sidebar widget list, if needed. Will also save updated list, if
 * needed.
 *
 * @since 2.2.0
 * @access private
 *
 * @param bool $deprecated Not used (deprecated).
 * @return array Upgraded list of widgets to version 3 array format when called from the admin.
 */
function wp_get_sidebars_widgets($deprecated = true) {
	if ( $deprecated !== true )
		_deprecated_argument( __FUNCTION__, &#039;2.8.1&#039; );

	global $_wp_sidebars_widgets, $sidebars_widgets;

	// If loading from front page, consult $_wp_sidebars_widgets rather than options
	// to see if wp_convert_widget_settings() has made manipulations in memory.
	if ( !is_admin() ) {
		if ( empty($_wp_sidebars_widgets) )
			$_wp_sidebars_widgets = get_option(&#039;sidebars_widgets&#039;, array());

		$sidebars_widgets = $_wp_sidebars_widgets;
	} else {
		$sidebars_widgets = get_option(&#039;sidebars_widgets&#039;, array());
	}

	if ( is_array( $sidebars_widgets ) &amp;&amp; isset($sidebars_widgets[&#039;array_version&#039;]) )
		unset($sidebars_widgets[&#039;array_version&#039;]);

	/**
	 * Filter the list of sidebars and their widgets.
	 *
	 * @since 2.7.0
	 *
	 * @param array $sidebars_widgets An associative array of sidebars and their widgets.
	 */
	$sidebars_widgets = apply_filters( &#039;sidebars_widgets&#039;, $sidebars_widgets );
	return $sidebars_widgets;
}

/**
 * Set the sidebar widget option to update sidebars.
 *
 * @since 2.2.0
 * @access private
 *
 * @param array $sidebars_widgets Sidebar widgets and their settings.
 */
function wp_set_sidebars_widgets( $sidebars_widgets ) {
	if ( !isset( $sidebars_widgets[&#039;array_version&#039;] ) )
		$sidebars_widgets[&#039;array_version&#039;] = 3;
	update_option( &#039;sidebars_widgets&#039;, $sidebars_widgets );
}

/**
 * Retrieve default registered sidebars list.
 *
 * @since 2.2.0
 * @access private
 *
 * @return array
 */
function wp_get_widget_defaults() {
	global $wp_registered_sidebars;

	$defaults = array();

	foreach ( (array) $wp_registered_sidebars as $index =&gt; $sidebar )
		$defaults[$index] = array();

	return $defaults;
}

/**
 * Convert the widget settings from single to multi-widget format.
 *
 * @since 2.8.0
 *
 * @return array
 */
function wp_convert_widget_settings($base_name, $option_name, $settings) {
	// This test may need expanding.
	$single = $changed = false;
	if ( empty($settings) ) {
		$single = true;
	} else {
		foreach ( array_keys($settings) as $number ) {
			if ( &#039;number&#039; == $number )
				continue;
			if ( !is_numeric($number) ) {
				$single = true;
				break;
			}
		}
	}

	if ( $single ) {
		$settings = array( 2 =&gt; $settings );

		// If loading from the front page, update sidebar in memory but don&#039;t save to options
		if ( is_admin() ) {
			$sidebars_widgets = get_option(&#039;sidebars_widgets&#039;);
		} else {
			if ( empty($GLOBALS[&#039;_wp_sidebars_widgets&#039;]) )
				$GLOBALS[&#039;_wp_sidebars_widgets&#039;] = get_option(&#039;sidebars_widgets&#039;, array());
			$sidebars_widgets = &amp;$GLOBALS[&#039;_wp_sidebars_widgets&#039;];
		}

		foreach ( (array) $sidebars_widgets as $index =&gt; $sidebar ) {
			if ( is_array($sidebar) ) {
				foreach ( $sidebar as $i =&gt; $name ) {
					if ( $base_name == $name ) {
						$sidebars_widgets[$index][$i] = &quot;$name-2&quot;;
						$changed = true;
						break 2;
					}
				}
			}
		}

		if ( is_admin() &amp;&amp; $changed )
			update_option(&#039;sidebars_widgets&#039;, $sidebars_widgets);
	}

	$settings[&#039;_multiwidget&#039;] = 1;
	if ( is_admin() )
		update_option( $option_name, $settings );

	return $settings;
}

/**
 * Output an arbitrary widget as a template tag.
 *
 * @since 2.8.0
 *
 * @param string $widget the widget&#039;s PHP class name (see default-widgets.php)
 * @param array $instance the widget&#039;s instance settings
 * @param array $args the widget&#039;s sidebar args
 * @return void
 **/
function the_widget($widget, $instance = array(), $args = array()) {
	global $wp_widget_factory;

	$widget_obj = $wp_widget_factory-&gt;widgets[$widget];
	if ( !is_a($widget_obj, &#039;WP_Widget&#039;) )
		return;

	$before_widget = sprintf(&#039;&lt;div class=&quot;widget %s&quot;&gt;&#039;, $widget_obj-&gt;widget_options[&#039;classname&#039;] );
	$default_args = array( &#039;before_widget&#039; =&gt; $before_widget, &#039;after_widget&#039; =&gt; &quot;&lt;/div&gt;&quot;, &#039;before_title&#039; =&gt; &#039;&lt;h2 class=&quot;widgettitle&quot;&gt;&#039;, &#039;after_title&#039; =&gt; &#039;&lt;/h2&gt;&#039; );

	$args = wp_parse_args($args, $default_args);
	$instance = wp_parse_args($instance);

	/**
	 * Fires before rendering the requested widget.
	 *
	 * @since 3.0.0
	 *
	 * @param string $widget   The widget&#039;s class name.
	 * @param array  $instance The current widget instance&#039;s settings.
	 * @param array  $args     An array of the widget&#039;s sidebar arguments.
	 */
	do_action( &#039;the_widget&#039;, $widget, $instance, $args );

	$widget_obj-&gt;_set(-1);
	$widget_obj-&gt;widget($args, $instance);
}

/**
 * Private
 */
function _get_widget_id_base($id) {
	return preg_replace( &#039;/-[0-9]+$/&#039;, &#039;&#039;, $id );
}

/**
 * Handle sidebars config after theme change
 *
 * @access private
 * @since 3.3.0
 */
function _wp_sidebars_changed() {
	global $sidebars_widgets;

	if ( ! is_array( $sidebars_widgets ) )
		$sidebars_widgets = wp_get_sidebars_widgets();

	retrieve_widgets(true);
}

/**
 * Look for &quot;lost&quot; widgets, this has to run at least on each theme change.
 *
 * @since 2.8.0
 *
 * @param mixed $theme_changed Whether the theme was changed as a boolean. A value
 *                             of &#039;customize&#039; defers updates for the customizer.
 * @return array
 */
function retrieve_widgets( $theme_changed = false ) {
	global $wp_registered_sidebars, $sidebars_widgets, $wp_registered_widgets;

	$registered_sidebar_keys = array_keys( $wp_registered_sidebars );
	$orphaned = 0;

	$old_sidebars_widgets = get_theme_mod( &#039;sidebars_widgets&#039; );
	if ( is_array( $old_sidebars_widgets ) ) {
		// time() that sidebars were stored is in $old_sidebars_widgets[&#039;time&#039;]
		$_sidebars_widgets = $old_sidebars_widgets[&#039;data&#039;];

		if ( &#039;customize&#039; !== $theme_changed ) {
			remove_theme_mod( &#039;sidebars_widgets&#039; );
		}

		foreach ( $_sidebars_widgets as $sidebar =&gt; $widgets ) {
			if ( &#039;wp_inactive_widgets&#039; == $sidebar || &#039;orphaned_widgets&#039; == substr( $sidebar, 0, 16 ) )
				continue;

			if ( !in_array( $sidebar, $registered_sidebar_keys ) ) {
				$_sidebars_widgets[&#039;orphaned_widgets_&#039; . ++$orphaned] = $widgets;
				unset( $_sidebars_widgets[$sidebar] );
			}
		}
	} else {
		if ( empty( $sidebars_widgets ) )
			return;

		unset( $sidebars_widgets[&#039;array_version&#039;] );

		$old = array_keys($sidebars_widgets);
		sort($old);
		sort($registered_sidebar_keys);

		if ( $old == $registered_sidebar_keys )
			return;

		$_sidebars_widgets = array(
			&#039;wp_inactive_widgets&#039; =&gt; !empty( $sidebars_widgets[&#039;wp_inactive_widgets&#039;] ) ? $sidebars_widgets[&#039;wp_inactive_widgets&#039;] : array()
		);

		unset( $sidebars_widgets[&#039;wp_inactive_widgets&#039;] );

		foreach ( $wp_registered_sidebars as $id =&gt; $settings ) {
			if ( $theme_changed ) {
				$_sidebars_widgets[$id] = array_shift( $sidebars_widgets );
			} else {
				// no theme change, grab only sidebars that are currently registered
				if ( isset( $sidebars_widgets[$id] ) ) {
					$_sidebars_widgets[$id] = $sidebars_widgets[$id];
					unset( $sidebars_widgets[$id] );
				}
			}
		}

		foreach ( $sidebars_widgets as $val ) {
			if ( is_array($val) &amp;&amp; ! empty( $val ) )
				$_sidebars_widgets[&#039;orphaned_widgets_&#039; . ++$orphaned] = $val;
		}
	}

	// discard invalid, theme-specific widgets from sidebars
	$shown_widgets = array();

	foreach ( $_sidebars_widgets as $sidebar =&gt; $widgets ) {
		if ( !is_array($widgets) )
			continue;

		$_widgets = array();
		foreach ( $widgets as $widget ) {
			if ( isset($wp_registered_widgets[$widget]) )
				$_widgets[] = $widget;
		}

		$_sidebars_widgets[$sidebar] = $_widgets;
		$shown_widgets = array_merge($shown_widgets, $_widgets);
	}

	$sidebars_widgets = $_sidebars_widgets;
	unset($_sidebars_widgets, $_widgets);

	// find hidden/lost multi-widget instances
	$lost_widgets = array();
	foreach ( $wp_registered_widgets as $key =&gt; $val ) {
		if ( in_array($key, $shown_widgets, true) )
			continue;

		$number = preg_replace(&#039;/.+?-([0-9]+)$/&#039;, &#039;$1&#039;, $key);

		if ( 2 &gt; (int) $number )
			continue;

		$lost_widgets[] = $key;
	}

	$sidebars_widgets[&#039;wp_inactive_widgets&#039;] = array_merge($lost_widgets, (array) $sidebars_widgets[&#039;wp_inactive_widgets&#039;]);
	if ( &#039;customize&#039; !== $theme_changed ) {
		wp_set_sidebars_widgets( $sidebars_widgets );
	}

	return $sidebars_widgets;
}
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