Bug #75320 [NEW]: Pack uses "a" and "Z" differently

From: andrey at kostin dot info Operating system: Ubuntu 16.04, Gentoo PHP version: 7.1.10 Package: Strings related Bug Type: Bug Bug description:Pack uses "a" and "Z" differently Description: ------------ I can be wrong, but documentation says that "a" and "Z" are equal since PHP 5.5 But it is not: php > var_dump(pack('a1', '1')); string(1) "1" php > var_dump(pack('Z1', '1')); string(1) "" If I'm wrong, please point to correct docs. Test script: --------------- <?php var_dump(pack('a1', '1') === pack('Z1', '1')); Expected result: ---------------- true Actual result: -------------- false -- Edit bug report at https://bugs.php.net/bug.php?id=75320&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75320&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75320&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75320&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75320&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75320&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75320&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75320&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75320&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75320&r=support Expected behavior: https://bugs.php.net/fix.php?id=75320&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75320&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75320&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75320&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75320&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75320&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75320&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75320&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75320&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75320&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75320&r=mysqlcfg