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@ 2013-07-16T16:55:57Z

<?php

var_dump(isset($var));
var_dump(empty($var));

$var = null;
var_dump(isset($var));
var_dump(empty($var));

$var = false;
var_dump(isset($var));
var_dump(empty($var));

Output
Performance
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var_dump: documentation ( source)

preferences:dark modelive preview

33.83 ms | 402 KiB | 5 Q