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./othercms/wordpress-6.0/wp-includes/customize/class-wp-customize-background-image-setting.php
<?php
/**
 * Customize API: WP_Customize_Background_Image_Setting class
 *
 * @package WordPress
 * @subpackage Customize
 * @since 4.4.0
 */

/**
 * Customizer Background Image Setting class.
 *
 * @since 3.4.0
 *
 * @see WP_Customize_Setting
 */
final class WP_Customize_Background_Image_Setting extends WP_Customize_Setting {
    public
$id = 'background_image_thumb';

   
/**
     * @since 3.4.0
     *
     * @param mixed $value The value to update. Not used.
     */
   
public function update( $value ) {
       
remove_theme_mod( 'background_image_thumb' );
    }
}