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@ 2013-09-04T10:46:09Z

<?php
$date='iiii';
    if(!is_numeric($date) || $date<=00 || $date>31){
		echo 1;
    }

Output
Performance
VLD
References
Branches

is_numeric: documentation ( source)

preferences:dark modelive preview

52.81 ms | 402 KiB | 5 Q