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run code in 300+ PHP versions simultaneously
<?php // Source: https://bugs.php.net/bug.php?id=60573 error_reporting(E_ALL | E_STRICT); class Foo { public function setSelf(self $s) { } } class Bar extends Foo { public function setSelf(self $s) { } }

preferences:
37.41 ms | 402 KiB | 5 Q