Doc #70177 [NEW]: Undecumented changes in mb_substr behavior

From: teo8976 at gmail dot com Operating system: all PHP version: Irrelevant Package: Documentation problem Bug Type: Documentation Problem Bug description:Undecumented changes in mb_substr behavior Description: ------------ --- From manual page: http://www.php.net/function.mb-substr --- Check this: http://3v4l.org/e1Pc4 1) The behavior of mb_substr with a negative value as first parameter is completely undocumented. (except for a user's comment) As expected, it matches that of substr, using the negative value as a starting character counting from the end of the string, but it needs to be documented. 2) The behavior with a negative value as the first parameter and NULL as the second changes at version 5.4.8 Starting from that version, it behaves as expected (taking the string to its end); previous to that version it returns an empty string. The behavior in older versions was obviously a bug, but the change should be documented. Also, if there's a value to be used instead of NULL as a workaround, that needs to be documented too. -- Edit bug report at https://bugs.php.net/bug.php?id=70177&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=70177&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=70177&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=70177&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=70177&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=70177&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=70177&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=70177&r=needscript Try newer version: https://bugs.php.net/fix.php?id=70177&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=70177&r=support Expected behavior: https://bugs.php.net/fix.php?id=70177&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=70177&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=70177&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=70177&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=70177&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=70177&r=dst IIS Stability: https://bugs.php.net/fix.php?id=70177&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=70177&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=70177&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=70177&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=70177&r=mysqlcfg