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@ 2015-06-18T15:08:03Z

<?php

function cats($x = null) {
    $y = array_merge(array(''), $x);
    print_r($y);
}

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_merge: documentation ( source)

preferences:dark modelive preview

59.78 ms | 402 KiB | 5 Q