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@ 2014-03-28T10:39:53Z

<?php

	$a = NULL;
$b = NULL;
$c = NULL;

	var_dump(isset($a));
var_dump(isset($b));
var_dump(empty($c));
var_dump(empty($d));

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

38.73 ms | 402 KiB | 5 Q