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@ 2014-04-23T10:55:29Z

<?php
$foo = 'foo';
var_dump(!$foo);

$foo = '100';
var_dump(!$foo);

$foo = '100.00';
var_dump(!$foo);

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

61.48 ms | 402 KiB | 5 Q