Bug #72993 [NEW]: abstract class with static methods: valid or not?

From: mlocati at gmail dot com Operating system: PHP version: 7.0.10 Package: Class/Object related Bug Type: Bug Bug description:abstract class with static methods: valid or not? Description: ------------ Consider this code: abstract class AbstractClass { abstract public static function Method(); } class ReadClass extends AbstractClass { public static function Method() { } } is this valid? See for instance https://3v4l.org/nSsLg - from PHP 5.0 to PHP 5.1: it was valid - from PHP 5.2 to PHP 5.6: we have this warning: Strict Standards: Static function AbstractClass::Method() should not be abstract - from PHP 7.0: it is again valid So... is this a wanted change? Or is it a bug in the 7.x series? PS: I'm not saying that it shouldn't be valid (indeed I'd prefer it's a legal approach) Related bugs: - https://bugs.php.net/bug.php?id=65809 There we just say that "The strict standards notice no longer exists in PHP 7", but does not say anything about the validity of abstract static methods in abstract classes - https://bugs.php.net/bug.php?id=66688 There the reporter suggests to remove static methods from abstract classes (why PHP should force this? It's a philosophy approach, subject to developers mind, and the language shouldn't force developers to not do something - people who think it's wrong can simply avoid that approach) -- Edit bug report at https://bugs.php.net/bug.php?id=72993&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=72993&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=72993&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=72993&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=72993&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=72993&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=72993&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=72993&r=needscript Try newer version: https://bugs.php.net/fix.php?id=72993&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=72993&r=support Expected behavior: https://bugs.php.net/fix.php?id=72993&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=72993&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=72993&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=72993&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=72993&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=72993&r=dst IIS Stability: https://bugs.php.net/fix.php?id=72993&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=72993&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=72993&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=72993&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=72993&r=mysqlcfg