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<?php $calc = function ($arg = null, $acc = '') use (&$calc) { return $arg === null ? $acc : function ($number = null) use (&$calc, $arg, $acc) { return $calc($number, $acc . $arg); }; }; $result = $calc(1)(3)(3)(7)(); var_dump($result); $result = $calc(2)(2)(8)(); var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
string(4) "1337" string(3) "228"

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