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<?php class A { public static $data = ['a']; public static function getData() { $classes = [get_called_class()]; $classes += class_parents($classes[0]); return call_user_func_array('array_merge', array_map( function($class) { return $class::$data; }, $classes ) ); } } class B extends A { public static $data = ['b']; } class C extends B { public static $data = ['c']; } class D extends C { public static $data = ['d']; } var_dump(A::getData()); var_dump(B::getData()); var_dump(C::getData()); var_dump(D::getData());
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(1) "a" } Fatal error: Uncaught ArgumentCountError: array_merge() does not accept unknown named parameters in /in/jsZqE:16 Stack trace: #0 /in/jsZqE(16): array_merge(Array, A: Array) #1 /in/jsZqE(38): A::getData() #2 {main} thrown in /in/jsZqE on line 16
Process exited with code 255.

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