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@ 2015-04-30T08:41:44Z

<?php

$digits = '1234567890';
$alnum  = '123test';

For($i = 0; $i < 1000000; $i++) {
var_dump(preg_match('/^\d+$/D', $digits));
var_dump(preg_match('/^\d+$/D', $alnum));
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

27.2 ms | 402 KiB | 5 Q