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<?php function add($x) { return function($y = null) use ($x) { if (is_null($y)) return $x; else return add($x + $y); }; } var_dump(add(2)); echo add(2)->__invoke(40)->__invoke();
Output for git.master, git.master_jit, rfc.property-hooks
object(Closure)#1 (2) { ["static"]=> array(1) { ["x"]=> int(2) } ["parameter"]=> array(1) { ["$y"]=> string(10) "<optional>" } } 42

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