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@ 2012-10-18T07:03:49Z

<?php
$int=0 ;
var_dump( strpos(log(($int^pow(2,ceil(log($int, 2)))-1)+1,2),'.'));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
strpos: documentation ( source)
ceil: documentation ( source)
log: documentation ( source)
pow: documentation ( source)

preferences:dark modelive preview

57.01 ms | 402 KiB | 5 Q