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@ 2014-04-15T18:45:59Z

<?php

var_dump(!!('' != null));
var_dump(!!(null != ''));
var_dump(!!(null != 0));
var_dump(!!(''));

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

48.93 ms | 402 KiB | 5 Q