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run code in 300+ PHP versions simultaneously
<?php class A { public static function who() { var_dump(get_called_class()); } } class B extends A { public static function who() { parent::who(); } } B::who(); call_user_func(array('A', 'who')); call_user_func(array('B', 'parent::who')); $method = array('B', 'parent::who'); $method(); ?>

preferences:
28.49 ms | 402 KiB | 5 Q