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@ 2013-12-21T23:14:34Z

<?php
$num1 = "5";

$num2 = "6";

function multi()

{

    global $num1,$num2;

    $num2 = null;

}

multi();

echo $num2;

var_dump($GLOBALS);

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

53.23 ms | 402 KiB | 5 Q