wp_list_pluck

Plucks a certain field out of each object or array in an array.

This has the same functionality and prototype of
array_column() (PHP 5.5) but also supports objects.

function wp_list_pluck( $list, $field, $index_key = null ) {
	if ( ! is_array( $list ) ) {
		return array();
	}

	$util = new WP_List_Util( $list );

	return $util->pluck( $field, $index_key );
}