WordPress at a glance
function is not described

add_custom_background() WP 3.0.0

Deprecated from version 3.4.0. It is no longer supported and can be removed in future releases. Use add_theme_support() instead.

Add callbacks for background image display.

No Hooks.

Return

null. Null. Nothing.

Usage

add_custom_background( $wp_head_callback, $admin_head_callback, $admin_preview_callback );
$wp_head_callback(callable)
Call on the 'wp_head' action.
$admin_head_callback(callable)
Call on custom background administration screen.
$admin_preview_callback(callable)
Output a custom background image div on the custom background administration screen. Optional.

Notes

  • See: add_theme_support()

Changelog

Since 3.0.0 Introduced.
Deprecated Since 3.4.0 Use add_theme_support()

Code of add_custom_background() WP 5.7.1

<?php
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 );
}