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run code in 300+ PHP versions simultaneously
<?php namespace B { class C { public static function f() { echo '1' . ' - ' . __CLASS__ . "\n"; } } C::f(); } namespace A\B { class C { public static function f() { echo '2' . ' - ' . __CLASS__ . "\n"; } } C::f(); } namespace A { $s = 'C::f'; call_user_func($s); }

preferences:
59.52 ms | 402 KiB | 5 Q