Simple recursive function to search a multidimensional array by a key, and return all the values of that key

search_multidimensional_array_by_key.php

<?php 

class SearchMultidimensionalArray
{
	public static function searchByKey($array, $needle, &$results) {
		if (is_array($array)) {
			foreach ($array as $item) {
				if (isset($item[$needle])) {
					$results[] = $item[$needle];
					continue;
				}

				if (is_array($item)) {
					self::searchByKey($item, $needle, $results);
				}
			}
		}
	}
}