- array_udiff: documentation ( source)
<?php
$foo[] = array('id' => 1, 'title' => 'ONE');
$foo[] = array('id' => 2, 'title' => 'TWO');
$bar[] = array('id' => 2, 'title' => 'dos');
$bar[] = array('id' => 2, 'title' => 'tres');
array_udiff($foo, $bar, function($a, $b) { print $a['title'] . " " . $b['title'] . "\n"; return 0;});