Bug #78407 [NEW]: Contravariant Parameters bug

From: damian dot jozwiak dot lodz at gmail dot com Operating system: Ubuntu 18.04 PHP version: 7.4.0beta2 Package: PHP Language Specification Bug Type: Bug Bug description:Contravariant Parameters bug Description: ------------ When class implement an interface it is not possible to override function parameter. The code works fine if base function is in class Test script: --------------- interface Test{ public function f1($param); } class inherited implements Test { public function f1(string $param):\DOMElement{ return new \DOMElement($param); } } $data = new inherited(); $node = $data->f1("node"); var_dump($node->nodeName); Expected result: ---------------- string(4) "node" Actual result: -------------- Fatal error: Declaration of inherited::f1(string $param): DOMElement must be compatible with Test::f1($param) -- Edit bug report at https://bugs.php.net/bug.php?id=78407&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=78407&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78407&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78407&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78407&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78407&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78407&r=support Expected behavior: https://bugs.php.net/fix.php?id=78407&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78407&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78407&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78407&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=78407&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=78407&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78407&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78407&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78407&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78407&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78407&r=mysqlcfg