1.1 misho 1: --TEST-- 2: Invalid format type validation 3: --FILE-- 4: <?php 5: var_dump(unpack("-2222", 1)); 6: echo "Done\n"; 7: ?> 8: --EXPECTF-- 9: Warning: unpack(): Invalid format type - in %sunpack.php on line %d 10: bool(false) 11: Done