WP_Customize_Setting::multidimensional( array $root, array $keys, bool $create = false ): array|void

Source

 * @param array $root
 * @param array $keys
 * @param bool  $create Default false.
 * @return array|void Keys are 'root', 'node', and 'key'.
 */
final protected function multidimensional( &$root, $keys, $create = false ) {
	if ( $create && empty( $root ) ) {
		$root = array();
	}

	if ( ! isset( $root ) || empty( $keys ) ) {
		return;
	}

	$last = array_pop( $keys );
	$node = &$root;

	foreach ( $keys as $key ) {
		if ( $create && ! isset( $node[ $key ] ) ) {
			$node[ $key ] = array();
		}

		if ( ! is_array( $node ) || ! isset( $node[ $key ] ) ) {
			return;
		}

		$node = &$node[ $key ];
	}

	if ( $create ) {
		if ( ! is_array( $node ) ) {
			// Account for an array overriding a string or object value.
			$node = array();
		}
		if ( ! isset( $node[ $last ] ) ) {
			$node[ $last ] = array();
		}
	}

	if ( ! isset( $node[ $last ] ) ) {
		return;
	}

	return array(

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