wp-includes/customize/class-wp-customize-background-image-setting.php:17Customizer Background Image Setting class.
$idstringpublicfinal class WP_Customize_Background_Image_Setting extends WP_Customize_Setting { /** * Unique string identifier for the setting. * * @since 3.4.0 * @var string */ 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' ); }}Introduced in 3.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/customize/class-wp-customize-background-image-setting.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.