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@ 2013-06-06T18:41:37Z

<?php
$bits = 64;
$N = 0xffffffffffffffff;
$result = -( pow(2, $bits) - $N ); 
echo $result;

Output
Performance
VLD
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pow: documentation ( source)

preferences:dark modelive preview

31.16 ms | 402 KiB | 5 Q