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<?php class A { public function x() { if (is_callable(array($this, "y"))) $this::y(); if (is_callable(array("self", "y"))) self::y(); } } class B extends A { public function y() {} } (new B())->x();
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Deprecated: Use of "self" in callables is deprecated in /in/gkMOi on line 6 Fatal error: Uncaught Error: Call to undefined method A::y() in /in/gkMOi:6 Stack trace: #0 /in/gkMOi(14): A->x() #1 {main} thrown in /in/gkMOi on line 6
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Fatal error: Uncaught Error: Call to undefined method A::y() in /in/gkMOi:6 Stack trace: #0 /in/gkMOi(14): A->x() #1 {main} thrown in /in/gkMOi on line 6
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Fatal error: Call to undefined method A::y() in /in/gkMOi on line 6
Process exited with code 255.

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