--TEST-- pack()/unpack(): "Z" format --FILE-- <?php var_dump( pack("Z0", "f"), pack("Z5", "foo\0"), pack("Z4", "fooo"), pack("Z4", "foo"), pack("Z*", "foo"), unpack("Z*", "foo\0\rbar\0 \t\r\n"), unpack("Z9", "foo\0\rbar\0 \t\r\n"), unpack("Z2", "\0"), unpack("Z2", "\0\0"), unpack("Z2", "A\0"), unpack("Z2", "AB\0"), unpack("Z2", "ABC") ); --EXPECTF-- Warning: unpack(): Type Z: not enough input, need 2, have 1 in %s on line %d string(0) "" string(5) "foo%c%c" string(4) "foo%c" string(4) "foo%c" string(4) "foo%c" array(1) { [1]=> string(3) "foo" } array(1) { [1]=> string(3) "foo" } bool(false) array(1) { [1]=> string(0) "" } array(1) { [1]=> string(1) "A" } array(1) { [1]=> string(2) "AB" } array(1) { [1]=> string(2) "AB" }