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@ 2015-05-05T08:56:02Z

<?php
$a = '0';
$b = 'NULL';

var_dump($a == $b);
var_dump(is_null($a));
var_dump(is_null($b));

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

46.81 ms | 402 KiB | 5 Q