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));

generator.php

<?php

function runner(\Closure $generator, $ctx, \Closure $printer = null, \Closure $interruptor = null) {
    if ($interruptor) if ($interruptor(...$ctx)) return;
    if ($printer) $printer(...$ctx);
    yield from runner($generator, $generator(...$ctx), $printer, $interruptor);
};

$printer = function($n){ob_start(); print $n.PHP_EOL.PHP_EOL; ob_end_flush();};
$interruptor = function($n){return $n >= PHP_INT_MAX;};

$fib = function($k){return ['gen'=>function($a, $b){return [$b, $a+$b];}, 'ctx'=>[1,1]][$k];};
// $fc  = function($k){return ['gen'=>function($a, $b){return [$a*$b, ++$b];}, 'ctx'=>[1,1]][$k];};

runner($fib('gen'), $fib('ctx'), $printer, $interruptor)->current();