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@ 2013-02-08T09:10:31Z

<?php
		$card_no = "0012345678901";
            $no = str_pad(substr($card_no, -4), strlen($card_no), 'X', STR_PAD_LEFT);

echo $no;

?>

Output
Performance
VLD
References
Branches

substr: documentation ( source)
str_pad: documentation ( source)

preferences:dark modelive preview

33.13 ms | 402 KiB | 5 Q