#40531 [NEW]: mb_substr optional parameters

From: emwebdev at hotmail dot com Operating system: Windows XP PHP version: 5.2.1 PHP Bug Type: mbstring related Bug description: mb_substr optional parameters Description: ------------ Hi there I'm not sure if the following is intended functionality or a bug, but I've tried many forums etc. and been unable to get an answer. When you use mb_substr() and omit the third argument (length), the function returns all characters from the start index to the end of the string. This is fine unless you want to specify the character encoding explicitly as the fourth argument. This forces you to supply the length argument also. It would seem logical that passing null for the length argument would make mb_substr() behave the same as if it had been omitted, but this is not the case. Passing null as the length argument to mb_substr() (or substr() itself for that matter) will produce an empty string every time. This means that to achieve the same functionality displayed when the length argument is omitted, you have to calculate the remaining string length yourself which is no doubt much less efficient. Thanks for your time, Erin Reproduce code: --------------- var_dump(substr('foobar', 3)); var_dump(substr('foobar', 3, null)); Expected result: ---------------- 'bar' (length=3) 'bar' (length=3) Actual result: -------------- 'bar' (length=3) '' (length=0) -- Edit bug report at http://bugs.php.net/?id=40531&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=40531&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=40531&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=40531&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=40531&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=40531&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=40531&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=40531&r=needscript Try newer version: http://bugs.php.net/fix.php?id=40531&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=40531&r=support Expected behavior: http://bugs.php.net/fix.php?id=40531&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=40531&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=40531&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=40531&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=40531&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=40531&r=dst IIS Stability: http://bugs.php.net/fix.php?id=40531&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=40531&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=40531&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=40531&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=40531&r=mysqlcfg