From: vrana Operating system: Windows PHP version: 5.4.0RC2 Package: Output Control Bug Type: Bug Bug description:Output is not discarded when ob_start() callback returns ""
Description: ------------ If ob_start() callback returns an empty string then nothing should be printed. This is the current behavior in PHP 5.3. Behavior in PHP 5.4 is different - if a callback returns an empty string then the result is same as if it wouldn't be called at all - next call is prepended by last call value. So there is no way for callback how to discard the output. Test script: --------------- ob_start(function ($s) { fwrite(STDERR, strlen($s) . "\n"); if ($s == "b\n") { return $s; } return ""; }, 2); echo "a\n"; echo "b\n"; exit; Expected result: ---------------- 2 2 b 0 Actual result: -------------- 2 4 4 -- Edit bug report at https://bugs.php.net/bug.php?id=60468&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=60468&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=60468&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=60468&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=60468&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=60468&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=60468&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=60468&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=60468&r=needscript Try newer version: https://bugs.php.net/fix.php?id=60468&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=60468&r=support Expected behavior: https://bugs.php.net/fix.php?id=60468&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=60468&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=60468&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=60468&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=60468&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=60468&r=dst IIS Stability: https://bugs.php.net/fix.php?id=60468&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=60468&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=60468&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=60468&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=60468&r=mysqlcfg