3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public $x; public function __construct($x) { $this->x = 2*$x; } private static function a($xs, $m) { return array_map(function($x) use ($m) { return new self($x*$m); }, $xs); } public static function b($xs) { return self::a($xs, 10); } } var_dump(Foo::b(array(1,2,3)));

preferences:
45.58 ms | 402 KiB | 5 Q