Bug #78517 [NEW]: Unable to connect two libraries where developer wants to return typehint

From: 6562680 at gmail dot com Operating system: Win10 PHP version: 7.2.22 Package: Reflection related Bug Type: Bug Bug description:Unable to connect two libraries where developer wants to return typehint Description: ------------ Maybe i understand interfaces incorrect but i think that we: 1. Create library 2. Create interface inside library 3. Upload library somewhere (composer) 4. Require library to project 5. Create interface in project for library wrapper 6. Will check our own interface inside project - library should match both interfaces and return instance that match both interfaces But sometimes we need to extend library or just change some functions using extend. We want to change return type to our own interface and we cant, because return checker wont check interface, just compare strings Test script: --------------- <?php interface iA {}; class A implements iA { public function test() : self // public function test() : A // or maybe direct class // public function test() : iA // or maybe interface { return true; } } interface iB {}; class B extends A implements iB { // public function test() : self // wtf? incorrect // public function test() : B // wtf? incorrect // public function test() : iA // works but requires use everywhere public function test() : A // works but requires use everywhere { return true; } } var_dump(new B); -- Edit bug report at https://bugs.php.net/bug.php?id=78517&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=78517&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78517&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78517&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78517&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78517&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78517&r=support Expected behavior: https://bugs.php.net/fix.php?id=78517&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78517&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78517&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78517&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=78517&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=78517&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78517&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78517&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78517&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78517&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78517&r=mysqlcfg