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@ 2014-02-16T16:54:26Z

<?php

$var = NULL;

var_dump(isset($var));

var_dump(array_key_exists($GLOBALS['var']));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_key_exists: documentation ( source)

preferences:dark modelive preview

48.03 ms | 402 KiB | 5 Q