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@ 2014-04-07T15:19:03Z

<?php

function whipme($a = NULL)
{
    $a--;
    $a++;
	var_dump($a);
}

whipme();
whipme(0);

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

30.12 ms | 402 KiB | 5 Q