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run code in 300+ PHP versions simultaneously
<?php class A { protected $a; public function foo() { strtolower( function () { set_error_handler(function() {}); $class = get_called_class(); restore_error_handler(); return $class; }); $f = function() { }; $f(); } } $a = new A; $a->foo();

preferences:
38.85 ms | 406 KiB | 6 Q