<?php $digits = '1234567890'; $alnum = '123test'; var_dump(preg_match('/^\d+$/D', $digits)); var_dump(preg_match('/^\d+$/D', $alnum)); var_dump(strspn($digits, $digits) === strlen($digits)); var_dump(strspn($alnum, $digits) === strlen($alnum)); var_dump((int)$digits == $digits); var_dump((int)$alnum == $alnum);
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