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@ 2013-11-19T09:30:58Z

<?php

function blop (&$a = null) {
$a = 'bla';
}

blop();

$b = null;
blop($b);
var_dump($b);

Output
Performance
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var_dump: documentation ( source)

preferences:dark modelive preview

38.81 ms | 402 KiB | 5 Q