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@ 2013-06-06T19:08:09Z

<?php
$msb =  -1 * pow(2,63);
for ($i=62; $i >= 0; $i--) {
	$result = pow(2,$i);
	$msb += $result;
}
echo $msb;

Output
Performance
VLD
References
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pow: documentation ( source)

preferences:dark modelive preview

37.13 ms | 402 KiB | 5 Q