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@ 2015-11-19T21:57:10Z

<?php
$a1 = array('red');
$a2 = array('red', 'blue');

$diff = array_udiff($a1, $a2,
        function($a, $b) {
            if($a === $b) {
                return 0;
            }
            else {
                return -1;
            }
        });

var_dump($diff);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_udiff: documentation ( source)

preferences:dark modelive preview

54.22 ms | 402 KiB | 5 Q