wp-includes/deprecated.php:3046Add callbacks for background image display.
$wp_head_callbackcallableoptional''$admin_head_callbackcallableoptional''$admin_preview_callbackcallableoptional''function add_custom_background( $wp_head_callback = '', $admin_head_callback = '', $admin_preview_callback = '' ) { _deprecated_function( __FUNCTION__, '3.4.0', 'add_theme_support( \'custom-background\', $args )' ); $args = array(); if ( $wp_head_callback ) $args['wp-head-callback'] = $wp_head_callback; if ( $admin_head_callback ) $args['admin-head-callback'] = $admin_head_callback; if ( $admin_preview_callback ) $args['admin-preview-callback'] = $admin_preview_callback; return add_theme_support( 'custom-background', $args );}Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.