Multi Dimensional array_unique

gistfile1.php

/**
   * Removes duplicate entries in a multi-dimensional array
	 * @param  array  $a the array you want to process
	 * @param  string $i the index you would like to run against
	 * @return array     the processed array
	 */
	public function md_array_unique($a, $i) {
		$unset = array();
		for($x = 0; $x < sizeof($a); $x++){
			for($y = 1; $y < (sizeof($a) - $x); $y++){
				if ($a[$x][$i] == $a[($x+$y)][$i]){
					$unset[] = ($x+$y);
				}
			}
		}
		foreach($unset as $key){
			unset($a[$key]);
		}
		return $a;
	}