Bug #79840 [NEW]: Union Type in argument reports types swapped in error message

From: carusogabriel Operating system: Any PHP version: master-Git-2020-07-12 (Git) Package: Scripting Engine problem Bug Type: Bug Bug description:Union Type in argument reports types swapped in error message Description: ------------ Playing around with PHP 8, I found something in Union Type's error messages, specific in typed arguments: the types are report in a different position from where they were declared. Test script: --------------- <?php class ValidMagicMethods { public function myMethod(string $name, array $arguments): mixed {} } final class NarrowedReturnType extends ValidMagicMethods { public function myMethod(string|array $name, bool $arguments): string|float|null {} } Expected result: ---------------- Fatal error: Declaration of NarrowedReturnType::myMethod(array|string $name, bool $arguments): string|float|null must be compatible with ValidMagicMethods::myMethod(string $name, array $arguments): mixed in /in/WE96o on line 8 Actual result: -------------- Fatal error: Declaration of NarrowedReturnType::myMethod(string|array $name, bool $arguments): string|float|null must be compatible with ValidMagicMethods::myMethod(string $name, array $arguments): mixed in /in/WE96o on line 8 -- Edit bug report at https://bugs.php.net/bug.php?id=79840&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=79840&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=79840&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=79840&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=79840&r=needscript Try newer version: https://bugs.php.net/fix.php?id=79840&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=79840&r=support Expected behavior: https://bugs.php.net/fix.php?id=79840&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=79840&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=79840&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=79840&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=79840&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=79840&r=dst IIS Stability: https://bugs.php.net/fix.php?id=79840&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=79840&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=79840&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=79840&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=79840&r=mysqlcfg