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// Internal Functions.

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/**

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* Retrieve full list of sidebars and their widget instance IDs.

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* Will upgrade sidebar widget list, if needed. Will also save updated list, if

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* needed.

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* @since 2.2.0

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* @access private

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* @global array $_wp_sidebars_widgets

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* @global array $sidebars_widgets

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* @param bool $deprecated Not used (argument deprecated).

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* @return array Upgraded list of widgets to version 3 array format when called from the admin.

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function wp_get_sidebars_widgets( $deprecated = true ) {

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if ( true !== $deprecated ) {

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_deprecated_argument( __FUNCTION__, '2.8.1' );

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}

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global $_wp_sidebars_widgets, $sidebars_widgets;

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* If loading from front page, consult $_wp_sidebars_widgets rather than options

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* to see if wp_convert_widget_settings() has made manipulations in memory.

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if ( ! is_admin() ) {

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if ( empty( $_wp_sidebars_widgets ) ) {

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$_wp_sidebars_widgets = get_option( 'sidebars_widgets', array() );

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}

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$sidebars_widgets = $_wp_sidebars_widgets;

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} else {

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$sidebars_widgets = get_option( 'sidebars_widgets', array() );

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}

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if ( is_array( $sidebars_widgets ) && isset( $sidebars_widgets['array_version'] ) ) {

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unset( $sidebars_widgets['array_version'] );

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}

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/**

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* Filters the list of sidebars and their widgets.

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* @since 2.7.0

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* @param array $sidebars_widgets An associative array of sidebars and their widgets.

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return apply_filters( 'sidebars_widgets', $sidebars_widgets );

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}

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/**

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* Retrieves the registered sidebar with the given ID.

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* @since 5.9.0

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* @global array $wp_registered_sidebars The registered sidebars.

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* @param string $id The sidebar ID.

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* @return array|null The discovered sidebar, or null if it is not registered.

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function wp_get_sidebar( $id ) {

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global $wp_registered_sidebars;

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foreach ( (array) $wp_registered_sidebars as $sidebar ) {

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if ( $sidebar['id'] === $id ) {

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return $sidebar;

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}

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}

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if ( 'wp_inactive_widgets' === $id ) {

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return array(

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'id' => 'wp_inactive_widgets',

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'name' => __( 'Inactive widgets' ),

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);

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}

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return null;

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}

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/**

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* Set the sidebar widget option to update sidebars.

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* @since 2.2.0

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* @access private

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* @global array $_wp_sidebars_widgets

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* @param array $sidebars_widgets Sidebar widgets and their settings.

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function wp_set_sidebars_widgets( $sidebars_widgets ) {

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global $_wp_sidebars_widgets;

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// Clear cached value used in wp_get_sidebars_widgets().

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$_wp_sidebars_widgets = null;

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if ( ! isset( $sidebars_widgets['array_version'] ) ) {

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$sidebars_widgets['array_version'] = 3;

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}

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update_option( 'sidebars_widgets', $sidebars_widgets );

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}

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/**

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* Retrieve default registered sidebars list.

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* @since 2.2.0

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* @access private

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* @global array $wp_registered_sidebars The registered sidebars.

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* @return array

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function wp_get_widget_defaults() {

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global $wp_registered_sidebars;

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$defaults = array();

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foreach ( (array) $wp_registered_sidebars as $index => $sidebar ) {

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$defaults[ $index ] = array();

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}

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return $defaults;

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}

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/**

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* Converts the widget settings from single to multi-widget format.

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* @since 2.8.0

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* @global array $_wp_sidebars_widgets

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* @param string $base_name Root ID for all widgets of this type.

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* @param string $option_name Option name for this widget type.

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* @param array $settings The array of widget instance settings.

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* @return array The array of widget settings converted to multi-widget format.

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function wp_convert_widget_settings( $base_name, $option_name, $settings ) {

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// This test may need expanding.

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$single = false;

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$changed = false;

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if ( empty( $settings ) ) {

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$single = true;

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} else {

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foreach ( array_keys( $settings ) as $number ) {

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if ( 'number' === $number ) {

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continue;

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}

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if ( ! is_numeric( $number ) ) {

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$single = true;

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break;

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}

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}

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}

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if ( $single ) {

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$settings = array( 2 => $settings );

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// If loading from the front page, update sidebar in memory but don't save to options.

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if ( is_admin() ) {

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$sidebars_widgets = get_option( 'sidebars_widgets' );

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} else {

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if ( empty( $GLOBALS['_wp_sidebars_widgets'] ) ) {

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$GLOBALS['_wp_sidebars_widgets'] = get_option( 'sidebars_widgets', array() );

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}

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$sidebars_widgets = &$GLOBALS['_wp_sidebars_widgets'];

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}

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foreach ( (array) $sidebars_widgets as $index => $sidebar ) {

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if ( is_array( $sidebar ) ) {

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foreach ( $sidebar as $i => $name ) {

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if ( $base_name === $name ) {

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$sidebars_widgets[ $index ][ $i ] = "$name-2";

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$changed = true;

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break 2;

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}

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}

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}

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}

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if ( is_admin() && $changed ) {

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update_option( 'sidebars_widgets', $sidebars_widgets );

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}

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}

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$settings['_multiwidget'] = 1;

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if ( is_admin() ) {

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update_option( $option_name, $settings );

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}

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return $settings;

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}

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/**

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* Output an arbitrary widget as a template tag.

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* @since 2.8.0

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* @global WP_Widget_Factory $wp_widget_factory

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* @param string $widget The widget's PHP class name (see class-wp-widget.php).

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* @param array $instance Optional. The widget's instance settings. Default empty array.

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* @param array $args {

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* Optional. Array of arguments to configure the display of the widget.

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* @type string $before_widget HTML content that will be prepended to the widget's HTML output.

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* Default `<div class="widget %s">`, where `%s` is the widget's class name.

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* @type string $after_widget HTML content that will be appended to the widget's HTML output.

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* Default `</div>`.

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* @type string $before_title HTML content that will be prepended to the widget's title when displayed.

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* Default `<h2 class="widgettitle">`.

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* @type string $after_title HTML content that will be appended to the widget's title when displayed.

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* Default `</h2>`.

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* }

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function the_widget( $widget, $instance = array(), $args = array() ) {

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global $wp_widget_factory;

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if ( ! isset( $wp_widget_factory->widgets[ $widget ] ) ) {

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_doing_it_wrong(

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__FUNCTION__,

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sprintf(

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/* translators: %s: register_widget() */

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__( 'Widgets need to be registered using %s, before they can be displayed.' ),

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'<code>register_widget()</code>'

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'4.9.0'

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);

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return;

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}

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$widget_obj = $wp_widget_factory->widgets[ $widget ];

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if ( ! ( $widget_obj instanceof WP_Widget ) ) {

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return;

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}

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$default_args = array(

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'before_widget' => '<div class="widget %s">',

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'after_widget' => '</div>',

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'before_title' => '<h2 class="widgettitle">',

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'after_title' => '</h2>',

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);

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

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$args['before_widget'] = sprintf( $args['before_widget'], $widget_obj->widget_options['classname'] );

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$instance = wp_parse_args( $instance );

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/** This filter is documented in wp-includes/class-wp-widget.php */

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$instance = apply_filters( 'widget_display_callback', $instance, $widget_obj, $args );

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if ( false === $instance ) {

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return;

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}

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/**

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* Fires before rendering the requested widget.

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* @since 3.0.0

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* @param string $widget The widget's class name.

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* @param array $instance The current widget instance's settings.

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* @param array $args An array of the widget's sidebar arguments.

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do_action( 'the_widget', $widget, $instance, $args );

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$widget_obj->_set( -1 );

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$widget_obj->widget( $args, $instance );

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}

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/**

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* Retrieves the widget ID base value.

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* @since 2.8.0

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* @param string $id Widget ID.

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* @return string Widget ID base.

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function _get_widget_id_base( $id ) {

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return preg_replace( '/-[0-9]+$/', '', $id );

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}

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/**

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* Handle sidebars config after theme change

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* @access private

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* @since 3.3.0

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* @global array $sidebars_widgets

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function _wp_sidebars_changed() {

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global $sidebars_widgets;

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if ( ! is_array( $sidebars_widgets ) ) {

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$sidebars_widgets = wp_get_sidebars_widgets();

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}

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retrieve_widgets( true );

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}

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/**

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* Validates and remaps any "orphaned" widgets to wp_inactive_widgets sidebar,

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* and saves the widget settings. This has to run at least on each theme change.

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* For example, let's say theme A has a "footer" sidebar, and theme B doesn't have one.

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* After switching from theme A to theme B, all the widgets previously assigned

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* to the footer would be inaccessible. This function detects this scenario, and

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* moves all the widgets previously assigned to the footer under wp_inactive_widgets.

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* Despite the word "retrieve" in the name, this function actually updates the database

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* and the global `$sidebars_widgets`. For that reason it should not be run on front end,

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* unless the `$theme_changed` value is 'customize' (to bypass the database write).

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* @since 2.8.0

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* @global array $wp_registered_sidebars The registered sidebars.

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* @global array $sidebars_widgets

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* @global array $wp_registered_widgets The registered widgets.

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* @param string|bool $theme_changed Whether the theme was changed as a boolean. A value

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* of 'customize' defers updates for the Customizer.

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* @return array Updated sidebars widgets.

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function retrieve_widgets( $theme_changed = false ) {

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global $wp_registered_sidebars, $sidebars_widgets, $wp_registered_widgets;

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$registered_sidebars_keys = array_keys( $wp_registered_sidebars );

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$registered_widgets_ids = array_keys( $wp_registered_widgets );

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if ( ! is_array( get_theme_mod( 'sidebars_widgets' ) ) ) {

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if ( empty( $sidebars_widgets ) ) {

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return array();

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}

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unset( $sidebars_widgets['array_version'] );

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$sidebars_widgets_keys = array_keys( $sidebars_widgets );

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sort( $sidebars_widgets_keys );

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sort( $registered_sidebars_keys );

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if ( $sidebars_widgets_keys === $registered_sidebars_keys ) {

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$sidebars_widgets = _wp_remove_unregistered_widgets( $sidebars_widgets, $registered_widgets_ids );

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return $sidebars_widgets;

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}

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}

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// Discard invalid, theme-specific widgets from sidebars.

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$sidebars_widgets = _wp_remove_unregistered_widgets( $sidebars_widgets, $registered_widgets_ids );

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$sidebars_widgets = wp_map_sidebars_widgets( $sidebars_widgets );

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// Find hidden/lost multi-widget instances.

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$shown_widgets = array_merge( ...array_values( $sidebars_widgets ) );

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$lost_widgets = array_diff( $registered_widgets_ids, $shown_widgets );

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foreach ( $lost_widgets as $key => $widget_id ) {

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$number = preg_replace( '/.+?-([0-9]+)$/', '$1', $widget_id );

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// Only keep active and default widgets.

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if ( is_numeric( $number ) && (int) $number < 2 ) {

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unset( $lost_widgets[ $key ] );

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}

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}

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$sidebars_widgets['wp_inactive_widgets'] = array_merge( $lost_widgets, (array) $sidebars_widgets['wp_inactive_widgets'] );

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if ( 'customize' !== $theme_changed ) {

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// Update the widgets settings in the database.

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wp_set_sidebars_widgets( $sidebars_widgets );

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}

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return $sidebars_widgets;

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}

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[1373] Fix | Delete

/**

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* Compares a list of sidebars with their widgets against an allowed list.

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* @since 4.9.0

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* @since 4.9.2 Always tries to restore widget assignments from previous data, not just if sidebars needed mapping.

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* @global array $wp_registered_sidebars The registered sidebars.

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* @param array $existing_sidebars_widgets List of sidebars and their widget instance IDs.

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* @return array Mapped sidebars widgets.

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function wp_map_sidebars_widgets( $existing_sidebars_widgets ) {

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global $wp_registered_sidebars;

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$new_sidebars_widgets = array(

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'wp_inactive_widgets' => array(),

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);

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// Short-circuit if there are no sidebars to map.

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if ( ! is_array( $existing_sidebars_widgets ) || empty( $existing_sidebars_widgets ) ) {

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return $new_sidebars_widgets;

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}

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foreach ( $existing_sidebars_widgets as $sidebar => $widgets ) {

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if ( 'wp_inactive_widgets' === $sidebar || str_starts_with( $sidebar, 'orphaned_widgets' ) ) {

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$new_sidebars_widgets['wp_inactive_widgets'] = array_merge( $new_sidebars_widgets['wp_inactive_widgets'], (array) $widgets );

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unset( $existing_sidebars_widgets[ $sidebar ] );

[1400] Fix | Delete

}

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}

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// If old and new theme have just one sidebar, map it and we're done.

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if ( 1 === count( $existing_sidebars_widgets ) && 1 === count( $wp_registered_sidebars ) ) {

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$new_sidebars_widgets[ key( $wp_registered_sidebars ) ] = array_pop( $existing_sidebars_widgets );

[1406] Fix | Delete

[1407] Fix | Delete

return $new_sidebars_widgets;

[1408] Fix | Delete

}

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[1410] Fix | Delete

// Map locations with the same slug.

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$existing_sidebars = array_keys( $existing_sidebars_widgets );

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[1413] Fix | Delete

foreach ( $wp_registered_sidebars as $sidebar => $name ) {

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if ( in_array( $sidebar, $existing_sidebars, true ) ) {

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$new_sidebars_widgets[ $sidebar ] = $existing_sidebars_widgets[ $sidebar ];

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unset( $existing_sidebars_widgets[ $sidebar ] );

[1417] Fix | Delete

} elseif ( ! array_key_exists( $sidebar, $new_sidebars_widgets ) ) {

[1418] Fix | Delete

$new_sidebars_widgets[ $sidebar ] = array();

[1419] Fix | Delete

}

[1420] Fix | Delete

}

[1421] Fix | Delete

[1422] Fix | Delete

// If there are more sidebars, try to map them.

[1423] Fix | Delete

if ( ! empty( $existing_sidebars_widgets ) ) {

[1424] Fix | Delete

[1425] Fix | Delete

[1426] Fix | Delete

* If old and new theme both have sidebars that contain phrases

[1427] Fix | Delete

* from within the same group, make an educated guess and map it.

[1428] Fix | Delete

[1429] Fix | Delete

$common_slug_groups = array(

[1430] Fix | Delete

array( 'sidebar', 'primary', 'main', 'right' ),

[1431] Fix | Delete

array( 'second', 'left' ),

[1432] Fix | Delete

array( 'sidebar-2', 'footer', 'bottom' ),

[1433] Fix | Delete

array( 'header', 'top' ),

[1434] Fix | Delete

);

[1435] Fix | Delete

[1436] Fix | Delete

// Go through each group...

[1437] Fix | Delete

foreach ( $common_slug_groups as $slug_group ) {

[1438] Fix | Delete

[1439] Fix | Delete

// ...and see if any of these slugs...

[1440] Fix | Delete

foreach ( $slug_group as $slug ) {

[1441] Fix | Delete

[1442] Fix | Delete

// ...and any of the new sidebars...

[1443] Fix | Delete

foreach ( $wp_registered_sidebars as $new_sidebar => $args ) {

[1444] Fix | Delete

[1445] Fix | Delete

// ...actually match!

[1446] Fix | Delete

if ( false === stripos( $new_sidebar, $slug ) && false === stripos( $slug, $new_sidebar ) ) {

[1447] Fix | Delete

continue;

[1448] Fix | Delete

}

[1449] Fix | Delete

[1450] Fix | Delete

// Then see if any of the existing sidebars...

[1451] Fix | Delete

foreach ( $existing_sidebars_widgets as $sidebar => $widgets ) {

[1452] Fix | Delete

[1453] Fix | Delete

// ...and any slug in the same group...

[1454] Fix | Delete

foreach ( $slug_group as $slug ) {

[1455] Fix | Delete

[1456] Fix | Delete

// ... have a match as well.

[1457] Fix | Delete

if ( false === stripos( $sidebar, $slug ) && false === stripos( $slug, $sidebar ) ) {

[1458] Fix | Delete

continue;

[1459] Fix | Delete

}

[1460] Fix | Delete

[1461] Fix | Delete

// Make sure this sidebar wasn't mapped and removed previously.

[1462] Fix | Delete

if ( ! empty( $existing_sidebars_widgets[ $sidebar ] ) ) {

[1463] Fix | Delete

[1464] Fix | Delete

// We have a match that can be mapped!

[1465] Fix | Delete

$new_sidebars_widgets[ $new_sidebar ] = array_merge( $new_sidebars_widgets[ $new_sidebar ], $existing_sidebars_widgets[ $sidebar ] );

[1466] Fix | Delete

[1467] Fix | Delete

// Remove the mapped sidebar so it can't be mapped again.

[1468] Fix | Delete

unset( $existing_sidebars_widgets[ $sidebar ] );

[1469] Fix | Delete

[1470] Fix | Delete

// Go back and check the next new sidebar.

[1471] Fix | Delete

continue 3;

[1472] Fix | Delete

}

[1473] Fix | Delete

} // End foreach ( $slug_group as $slug ).

[1474] Fix | Delete

} // End foreach ( $existing_sidebars_widgets as $sidebar => $widgets ).

[1475] Fix | Delete

} // End foreach ( $wp_registered_sidebars as $new_sidebar => $args ).

[1476] Fix | Delete

} // End foreach ( $slug_group as $slug ).

[1477] Fix | Delete

} // End foreach ( $common_slug_groups as $slug_group ).

[1478] Fix | Delete

}

[1479] Fix | Delete

[1480] Fix | Delete

// Move any left over widgets to inactive sidebar.

[1481] Fix | Delete

foreach ( $existing_sidebars_widgets as $widgets ) {

[1482] Fix | Delete

if ( is_array( $widgets ) && ! empty( $widgets ) ) {

[1483] Fix | Delete

$new_sidebars_widgets['wp_inactive_widgets'] = array_merge( $new_sidebars_widgets['wp_inactive_widgets'], $widgets );

[1484] Fix | Delete

}

[1485] Fix | Delete

}

[1486] Fix | Delete

[1487] Fix | Delete

// Sidebars_widgets settings from when this theme was previously active.

[1488] Fix | Delete

$old_sidebars_widgets = get_theme_mod( 'sidebars_widgets' );

[1489] Fix | Delete

$old_sidebars_widgets = isset( $old_sidebars_widgets['data'] ) ? $old_sidebars_widgets['data'] : false;

[1490] Fix | Delete

[1491] Fix | Delete

if ( is_array( $old_sidebars_widgets ) ) {

[1492] Fix | Delete

[1493] Fix | Delete

// Remove empty sidebars, no need to map those.

[1494] Fix | Delete

$old_sidebars_widgets = array_filter( $old_sidebars_widgets );

[1495] Fix | Delete

[1496] Fix | Delete

// Only check sidebars that are empty or have not been mapped to yet.

[1497] Fix | Delete

foreach ( $new_sidebars_widgets as $new_sidebar => $new_widgets ) {

[1498] Fix | Delete

if ( array_key_exists( $new_sidebar, $old_sidebars_widgets ) && ! empty( $new_widgets ) ) {

[1499] Fix | Delete

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