Function to recursively flatten multidimensional PHP array.
<?php
// Requires PHP 5.3+
// Found here: http://stackoverflow.com/a/1320156
function flatten_array(array $array) {
$flattened_array = array();
array_walk_recursive($array, function($a) use (&$flattened_array) { $flattened_array[] = $a; });
return $flattened_array;
}