wp-includes/class-wp-customize-widgets.php:1306Communicates the sidebars that appeared on the page at the very end of the page, and at the very end of the wp_footer,
public function export_preview_data() { global $wp_registered_sidebars, $wp_registered_widgets; $switched_locale = switch_to_user_locale( get_current_user_id() ); $l10n = array( 'widgetTooltip' => __( 'Shift-click to edit this widget.' ), ); if ( $switched_locale ) { restore_previous_locale(); } $rendered_sidebars = array_filter( $this->rendered_sidebars ); $rendered_widgets = array_filter( $this->rendered_widgets ); // Prepare Customizer settings to pass to JavaScript. $settings = array( 'renderedSidebars' => array_fill_keys( array_keys( $rendered_sidebars ), true ), 'renderedWidgets' => array_fill_keys( array_keys( $rendered_widgets ), true ), 'registeredSidebars' => array_values( $wp_registered_sidebars ), 'registeredWidgets' => $wp_registered_widgets, 'l10n' => $l10n, 'selectiveRefreshableWidgets' => $this->get_selective_refreshable_widgets(), ); foreach ( $settings['registeredWidgets'] as &$registered_widget ) { unset( $registered_widget['callback'] ); // May not be JSON-serializable. } wp_print_inline_script_tag( sprintf( 'var _wpWidgetCustomizerPreviewSettings = %s;', wp_json_encode( $settings, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ) ) . "\n//# sourceURL=" . rawurlencode( __METHOD__ ) ); }Introduced in 3.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-customize-widgets.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.