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<?php class A { public function x() { return 'x'; } } $a = new A(); var_dump( call_user_func([$a, 'x']), call_user_func([$a, 'y']) );
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, class A does not have a method "y" in /in/guDVU:13 Stack trace: #0 {main} thrown in /in/guDVU on line 13
Process exited with code 255.

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