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@ 2014-06-15T04:53:10Z

<?php
$mystring = null;
$arr = get_defined_vars();
echo in_array('mystring',$arr);

Output
Performance
VLD
References
Branches

get_defined_vars: documentation ( source)
in_array: documentation ( source)

preferences:dark modelive preview

40.78 ms | 402 KiB | 5 Q