My PHP Currying implementation

curry.php

<?php

function curry(\Closure $f) {
    $rf = new \ReflectionFunction($f);
    $arity = $rf->getNumberOfParameters();

    function acc($f, $arity, $args=[]) {
        return function(...$acc) use($f, $arity, $args) {
            $acc = array_merge($args, $acc);
            return (count($acc) >= $arity) ? $f(...$acc) : acc($f, $arity, $acc);
        };
    };

    return acc($f, $arity);
};

// ==================================================

$sum_func = function($a,$b,$c) {
    return $a+$b+$c;
};
$cur = curry($sum_func);

var_dump($cur(1,2,3));
var_dump($cur(1,2)(3));
var_dump($cur(1)(2)(3));
var_dump($cur()(1)()(2)()(3));
var_dump($cur()()()()(1)()(2)()(3,4,5));