--TEST-- bitwise AND and strings --FILE-- <?php $s = "123"; $s1 = "234"; var_dump($s & $s1); $s = "test"; $s1 = "some"; var_dump($s & $s1); $s = "test long"; $s1 = "some"; var_dump($s & $s1); $s = "test"; $s1 = "some long"; var_dump($s & $s1); $s = "test"; $s &= "some long"; var_dump($s); echo "Done\n"; ?> --EXPECTF-- string(3) "020" string(4) "pead" string(4) "pead" string(4) "pead" string(4) "pead" Done