Bug #71358 [NEW]: Order of interfaces is meaningful

From: danack Operating system: PHP version: 7.0.2 Package: Scripting Engine problem Bug Type: Bug Bug description:Order of interfaces is meaningful Description: ------------ The check for whether a class is valid or not is dependent on what order the interfaces it implements are declared. The example below is simple, to show the bug clearly. A more realistic case would involve having multiple classes that implement various interfaces, including the "\Serializable" interface, and then realising that one of the user-defined interfaces should actually extend "\Serializable". This would make some code break, depending on what order the implements interfaces was written as. Test script: --------------- interface Base { const FOO = 5; function base(); } interface Derived extends Base { function derived(); } class ThisIsValid implements Base, Derived { public function base() {} public function derived() {} } class ThisWillError implements Derived, Base { public function base() {} public function derived() {} } Expected result: ---------------- No error, the definition of implements interfaces should not affect compilation. Actual result: -------------- Fatal error: Class ThisWillError cannot implement previously implemented interface Base in /in/Anc6g on line 18 -- Edit bug report at https://bugs.php.net/bug.php?id=71358&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=71358&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=71358&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=71358&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=71358&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=71358&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=71358&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=71358&r=needscript Try newer version: https://bugs.php.net/fix.php?id=71358&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=71358&r=support Expected behavior: https://bugs.php.net/fix.php?id=71358&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=71358&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=71358&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=71358&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=71358&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=71358&r=dst IIS Stability: https://bugs.php.net/fix.php?id=71358&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=71358&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=71358&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=71358&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=71358&r=mysqlcfg