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@ 2014-04-07T19:31:07Z

<?php
if(defined(WHATEVER_THIS_ISNT_DEFINED)){
   echo 'yup, constant defined';
}
else
{
   echo 'nope, does not exist';
}

Output
Performance
VLD
References
Branches

defined: documentation ( source)

preferences:dark modelive preview

54.31 ms | 402 KiB | 5 Q