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run code in 300+ PHP versions simultaneously
<?php class Func { public static function __callStatic($name, $arguments) { if (!function_exists($name)) { // include } return call_user_func_array($name, $arguments); } } Func::foo('bar'); Func::{'foo\\bar'}('qux');

preferences:
38.69 ms | 402 KiB | 5 Q