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run code in 300+ PHP versions simultaneously
<?php set_error_handler(function($errno, $errstr, $errfile, $errline){ echo $errstr."\n"; new MyOtherClass; }); spl_autoload_register(function($class){ echo $class."\n"; return eval("class $class{}"); }); eval(' class MyConcrete extends MyAbstract { public static function createInstance() {} } abstract class MyAbstract { public abstract static function createInstance(); } ');

preferences:
38.57 ms | 402 KiB | 5 Q