--TEST-- XORing strings --FILE-- <?php $s = "123"; $s1 = "test"; $s2 = "45345some"; $s3 = str_repeat("f", 1); $s4 = str_repeat("f", 2); $s ^= 22; var_dump($s); $s1 ^= 11; var_dump($s1); $s2 ^= 33; var_dump($s2); $s3 ^= " "; var_dump($s3); $s4 ^= " "; var_dump($s4); echo "Done\n"; ?> --EXPECTF-- int(109) Warning: A non-numeric value encountered in %s on line %d int(11) Notice: A non well formed numeric value encountered in %s on line %d int(45312) string(1) "F" string(2) "FF" Done