Bug #77294 [NEW]: Abstract trait method implementation

From: chasepeeler at gmail dot com Operating system: Windows PHP version: 7.0.33 Package: Class/Object related Bug Type: Bug Bug description:Abstract trait method implementation Description: ------------ If a child class uses a trait with an abstract method, while it's parent class uses a trait with a defined method of the same name, the method from the parent classes trait will act as the implementation of the abstract method. The issue also exists in cases where a class uses two traits. One trait contains an abstract method while the other trait contains a defined method of the same name. When executed, the defined method will act as the implementation of the abstract method. I don't know if this is a bug or an undocumented feature. If it isn't a bug, then it breaks the "compiler assisted copy/paste rule" since copy/pasting the traits into the classes would cause an error. It also appears to violate the documented behavior in relation to conflict resolution: http://php.net/manual/en/language.oop5.traits.php#language.oop5.traits.conflict. If it isn't a bug, then the documentation needs to be updated to better explain this situation. Test script: --------------- https://3v4l.org/OKoTY -- Edit bug report at https://bugs.php.net/bug.php?id=77294&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=77294&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=77294&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=77294&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=77294&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=77294&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=77294&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=77294&r=needscript Try newer version: https://bugs.php.net/fix.php?id=77294&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=77294&r=support Expected behavior: https://bugs.php.net/fix.php?id=77294&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=77294&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=77294&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=77294&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77294&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=77294&r=dst IIS Stability: https://bugs.php.net/fix.php?id=77294&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=77294&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=77294&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=77294&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=77294&r=mysqlcfg