Bug #81611 [Com]: ArgumentCountError when getting default value from ReflectionParameter with new

Edit report at https://bugs.php.net/bug.php?id=81611&edit=1 ID: 81611 Comment by: camporter1 at gmail dot com Reported by: ondrej at mirtes dot cz Summary: ArgumentCountError when getting default value from ReflectionParameter with new Status: Open Type: Bug Package: Reflection related Operating System: N/A PHP Version: 8.1.0RC5 Block user comment: N Private report: N New Comment: Created https://github.com/php/php-src/pull/7649 Previous Comments: ------------------------------------------------------------------------ [2021-11-12 17:37:28] camporter1 at gmail dot com @nikic Sure, I'll have one ready in a few hours. ------------------------------------------------------------------------ [2021-11-12 09:33:14] nikic@php.net @camporter1: Your patch looks reasonable to me, would you like to submit a PR? ------------------------------------------------------------------------ [2021-11-12 03:27:48] camporter1 at gmail dot com The issue seems to be that the scope is not correct when the class is determined when evaluating new self(). A hacky patch would be https://gist.github.com/camporter/0fe6df7909c2473323f6892ced78fb62 which allows zend_ast_fetch_class to provide the scope it was given rather than relying on the current executed scope. ------------------------------------------------------------------------ [2021-11-11 08:44:09] ondrej at mirtes dot cz Description: ------------ Trying to get a default value from ReflectionParameter when the default value contains "new" leads to "Uncaught ArgumentCountError: ReflectionParameter::__construct() expects exactly 2 arguments, 0 given" from an internal function. Test script: --------------- <?php // lint >= 8.1 namespace NewInInitializers; class Foo { public function doFoo( object $test = new self() ): object { return $test; } } class Bar extends Foo { } $ref = new \ReflectionClass(Foo::class); $params = $ref->getMethod('doFoo')->getParameters(); foreach ($params as $param) { var_dump($param->getDefaultValue()); } Expected result: ---------------- object(NewInInitializers\Foo)#1 (0) { } Actual result: -------------- Fatal error: Uncaught ArgumentCountError: ReflectionParameter::__construct() expects exactly 2 arguments, 0 given in /in/aJ2qI:25 Stack trace: #0 [internal function]: ReflectionParameter->__construct() #1 /in/aJ2qI(25): ReflectionParameter->getDefaultValue() #2 {main} thrown in /in/aJ2qI on line 25 Process exited with code 255. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81611&edit=1