Online PHP editor | refs for sctIN

@ 2017-07-04T09:39:38Z

<?php

$calc = function ($arg = null, $acc = '') use (&$calc) {
    return $arg === null ? $acc : function ($arg = null, $saved = '') use (&$calc, $acc) {
        return $calc($arg, $arg . $acc . $saved);
    };
};

$result = $calc(1)(3)(3)(8)();
var_dump($result);