Req #69110 [NEW]: Abstract method inheritance behaves differently from concrete inheritance

From: draconyster at gmai dot com Operating system: PHP version: Irrelevant Package: Scripting Engine problem Bug Type: Feature/Change Request Bug description:Abstract method inheritance behaves differently from concrete inheritance Description: ------------ When extending abstract classes you are not allowed to change an abstract method's signature to a compatible one. This works perfectly fine for concrete classes though. Test script: --------------- //This code works: class A { public function a () {} } class B extends A { public function a ($t = false) {} } //this code throws an error: abstract class A { abstract public function a (); } abstract class B extends A { abstract public function a ($t = false); } Expected result: ---------------- Extending an abstract method should behaves consistently with extending concrete methods Actual result: -------------- Fatal error: Can't inherit abstract function A::a() (previously declared abstract in B) -- Edit bug report at https://bugs.php.net/bug.php?id=69110&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=69110&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=69110&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=69110&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=69110&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=69110&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=69110&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=69110&r=needscript Try newer version: https://bugs.php.net/fix.php?id=69110&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=69110&r=support Expected behavior: https://bugs.php.net/fix.php?id=69110&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=69110&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=69110&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=69110&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=69110&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=69110&r=dst IIS Stability: https://bugs.php.net/fix.php?id=69110&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=69110&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=69110&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=69110&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=69110&r=mysqlcfg