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@ 2013-10-08T08:59:14Z

<?php
$id = "1%0AUNION SELECT 1,2,3,4,5,6 -- -";
if (preg_match('/^[0-9]+$/m', $id)) {
    echo 'This is a valid id.';
} else {
    echo 'Are you trying to hack me?';
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive preview

39.98 ms | 402 KiB | 5 Q