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@ 2016-03-21T13:13:33Z

<?php

$a = [];
$b = [];

var_dump(array_diff_key($a, $b));
if (array_diff_key($a, $b)) {
    var_dump('true');
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_diff_key: documentation ( source)

preferences:dark modelive preview

51.23 ms | 402 KiB | 5 Q