Edit report at https://bugs.php.net/bug.php?id=61038&edit=1
ID: 61038 Updated by: cataphr...@php.net Reported by: su dot hang at yahoo dot com Summary: unpack("a5", "str\0") does not work as expected -Status: Open +Status: Not a bug Type: Bug Package: *General Issues Operating System: Linux (3.0.0-15-generic) PHP Version: Irrelevant Block user comment: N Private report: N New Comment: I don't see anything wrong here. unpack("a5", "foo\0\0") removes the NULL padding from the input string. The 5 specifies only the size of the input to consume: php > var_dump(unpack("a5", "foo\0")); PHP Warning: unpack(): Type a: not enough input, need 5, have 4 in php shell code on line 1 Previous Comments: ------------------------------------------------------------------------ [2012-02-10 09:20:26] su dot hang at yahoo dot com Description: ------------ related bug: https://bugs.php.net/bug.php?id=39588 if unpacking from a binary string ending with any number of "\0"'s, and the unpack string length is given, the resulted string does not have the right length. for example, unpack("a5", "str\0") should result in a 5-byte-long string, but it returns a 3-byte-long instead. Test script: --------------- <?php $var = "str"; $packed = pack("a5", $var); // 5 bytes long NULL-padded string var_dump(unpack("a5", $packed)); Expected result: ---------------- array(1) { [1]=> string(5) "str\0\0" } Actual result: -------------- array(1) { [1]=> string(3) "str" } ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=61038&edit=1