#49636 [Fbk-Csd]: PHP_INT_SIZE inconsistent with pack(i)
ID: 49636 User updated by: hsu at jean-david dot com Reported By: hsu at jean-david dot com -Status: Feedback +Status: Closed Bug Type: Strings related Operating System: linux PHP Version: 5.2.11 New Comment: If there were a pack format character which is exactly the size of a PHP int, this would mean only PHP with the same int size could read it This is also true with the i format. The reason that I use pack is to manipulate bit streams in PHP, but yes, I would use serialize to just store an int. You are right, there is no big inconvenience using the l format and it's fixed size. I did not know that it was a design choice not to have a format character for a PHP int. Yes, please mark this bug as solved. Thank you for the explanation. Previous Comments: [2009-10-01 11:35:57] sjo...@php.net Correct. You can assume that an PHP int is always 32 bits and use l for pack. However, pack() is probably the wrong tool for the thing you want to do. The pack() function is mainly useful to interoperate with other programs or protocols. In that case, you typically know the format and sizes of things you want to pack. If there were a pack format character which is exactly the size of a PHP int, this would mean only PHP with the same int size could read it. If you want to store and retrieve data using only PHP, you are better off using serialize(). Is this clear, and do you consider this bug solved? [2009-09-24 10:41:35] hsu at jean-david dot com There is no easy way to pack a plain old php integer This means that pack has many different format codes but none for a php int? [2009-09-23 07:28:36] sjo...@php.net Thank you for your bug report. The integer in the pack documentation and the integer in the PHP integer documentation refer to different things. The pack integer is a C-style int. The PHP integer is implemented in a long. These do not need to be the same size. [2009-09-23 01:54:13] hsu at jean-david dot com Description: PHP pack documentation: i signed integer (machine dependent size and byte order) PHP integer documentation: Integer size can be determined using the constant PHP_INT_SIZE On some systems, I believe that the word integer will refer to objects of different sizes, such that pack(i, _) could point to an object of size X bytes and PHP_INT_SIZE return value Y which is inconsistent. /main/main.c l.1796: REGISTER_MAIN_LONG_CONSTANT(PHP_INT_SIZE, sizeof(long), CONST_PERSISTENT | CONST_CS); /ext/standard/pack.c l.402-403: php_pack(argv[currentarg++], sizeof(int), int_map, output[outputpos]); outputpos += sizeof(int); Reproduce code: --- file_put_contents(test.bin,pack(I, 2)); var_dump(PHP_INT_SIZE === filesize(test.bin)); Expected result: bool(true) Actual result: -- bool(false) -- Edit this bug report at http://bugs.php.net/?id=49636edit=1
#49636 [Opn]: PHP_INT_SIZE inconsistent with pack(i)
ID: 49636 User updated by: hsu at jean-david dot com Reported By: hsu at jean-david dot com Status: Open Bug Type: Math related Operating System: linux PHP Version: 5.2.11 New Comment: There is no easy way to pack a plain old php integer This means that pack has many different format codes but none for a php int? Previous Comments: [2009-09-23 07:28:36] sjo...@php.net Thank you for your bug report. The integer in the pack documentation and the integer in the PHP integer documentation refer to different things. The pack integer is a C-style int. The PHP integer is implemented in a long. These do not need to be the same size. [2009-09-23 01:54:13] hsu at jean-david dot com Description: PHP pack documentation: i signed integer (machine dependent size and byte order) PHP integer documentation: Integer size can be determined using the constant PHP_INT_SIZE On some systems, I believe that the word integer will refer to objects of different sizes, such that pack(i, _) could point to an object of size X bytes and PHP_INT_SIZE return value Y which is inconsistent. /main/main.c l.1796: REGISTER_MAIN_LONG_CONSTANT(PHP_INT_SIZE, sizeof(long), CONST_PERSISTENT | CONST_CS); /ext/standard/pack.c l.402-403: php_pack(argv[currentarg++], sizeof(int), int_map, output[outputpos]); outputpos += sizeof(int); Reproduce code: --- file_put_contents(test.bin,pack(I, 2)); var_dump(PHP_INT_SIZE === filesize(test.bin)); Expected result: bool(true) Actual result: -- bool(false) -- Edit this bug report at http://bugs.php.net/?id=49636edit=1
#49636 [NEW]: PHP_INT_SIZE inconsistent with pack(i
From: hsu at jean-david dot com Operating system: linux PHP version: 5.2.11 PHP Bug Type: Variables related Bug description: PHP_INT_SIZE inconsistent with pack(i Description: PHP pack documentation: i signed integer (machine dependent size and byte order) PHP integer documentation: Integer size can be determined using the constant PHP_INT_SIZE On some systems, I believe that the word integer will refer to objects of different sizes, such that pack(i, _) could point to an object of size X bytes and PHP_INT_SIZE return value Y which is inconsistent. /main/main.c l.1796: REGISTER_MAIN_LONG_CONSTANT(PHP_INT_SIZE, sizeof(long), CONST_PERSISTENT | CONST_CS); /ext/standard/pack.c l.402-403: php_pack(argv[currentarg++], sizeof(int), int_map, output[outputpos]); outputpos += sizeof(int); Reproduce code: --- file_put_contents(test.bin,pack(I, 2)); var_dump(PHP_INT_SIZE === filesize(test.bin)); Expected result: bool(true) Actual result: -- bool(false) -- Edit bug report at http://bugs.php.net/?id=49636edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=49636r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=49636r=trysnapshot53 Try a snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=49636r=trysnapshot60 Fixed in SVN: http://bugs.php.net/fix.php?id=49636r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=49636r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=49636r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=49636r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=49636r=needscript Try newer version: http://bugs.php.net/fix.php?id=49636r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=49636r=support Expected behavior: http://bugs.php.net/fix.php?id=49636r=notwrong Not enough info: http://bugs.php.net/fix.php?id=49636r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=49636r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=49636r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=49636r=php4 Daylight Savings:http://bugs.php.net/fix.php?id=49636r=dst IIS Stability: http://bugs.php.net/fix.php?id=49636r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=49636r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=49636r=float No Zend Extensions: http://bugs.php.net/fix.php?id=49636r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=49636r=mysqlcfg
