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add_custom_background is deprecated since version 3.4.0!
Alternative: Ver página de detalhe para add_theme_support »

" href="https://pt.wpseek.com/function/add_theme_support/">add_theme_support( 'custom-background', $args )

add_custom_background › WordPress Function

Desde3.0.0

Obsoleto3.4.0

› add_custom_background ( $wp_head_callback = '', $admin_head_callback = '', $admin_preview_callback = '' )

Parâmetros: (3)	(callable) $wp_head_callback Call on the {@see 'wp_head'} action. Required: No Padrão: (empty) (callable) $admin_head_callback Call on custom background administration screen. Required: No Padrão: (empty) (callable) $admin_preview_callback Output a custom background image div on the custom background administration screen. Optional. Required: No Padrão: (empty)
Ver:	Ver página de detalhe para add_theme_support » " href="https://pt.wpseek.com/function/add_theme_support/">add_theme_support()
Definido em:	wp-includes/deprecated.php , line 3041
Codex:	developer.wordpress.org / add_custom_background

Add callbacks for background image display.

Funções relacionadas: _custom_background_cb, remove_custom_background, add_custom_image_header, _custom_header_background_just_in_time, get_background_image

Fonte

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 );
}