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run code in 300+ PHP versions simultaneously
<?php class Foo { const A = 1; public function bar() { $x = function() { var_dump(static::A); var_dump(self::A); }; $x(); } } class Herp extends Foo { const A=2; } (new Herp())->bar();

preferences:
48.33 ms | 402 KiB | 5 Q