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run code in 300+ PHP versions simultaneously
<?php class A { public function x() { if (is_callable(array($this, "y"))) $this::y(); if (is_callable(array(self::class, "y"))) self::y(); } } class B extends A { public function y() {} } (new B())->x();

preferences:
59.46 ms | 402 KiB | 5 Q