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@ 2015-04-29T20:57:11Z

<?php

$value = md5('hello');
For($i = 0; $i < 1000000; $i++) {
   preg_match('/^\d+$/D', $value);
}
For($i = 0; $i < 1000000; $i++) {
   preg_match('/^\d+$/D', "$i");
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
md5: documentation ( source)

preferences:dark modelive preview

44.59 ms | 402 KiB | 5 Q