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<?php function add($x) { return function($y = null) use ($x) { if (is_null($y)) return $x; else return add($x + $y); }; } var_dump(add(2)); echo add(2)->__invoke(40)->__invoke();
based on uslfZ
Output for 5.3.0 - 7.1.0
object(Closure)#1 (2) { ["static"]=> array(1) { ["x"]=> int(2) } ["parameter"]=> array(1) { ["$y"]=> string(10) "<optional>" } } 42
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/LAcC3 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/LAcC3 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/LAcC3 on line 4
Process exited with code 255.