currying so far

curryandcompose.php

class Placeholder{}

function curry(callable $fn,...$start) {
	return function (...$args) use ($fn, $start){
		$apply = array_merge($start,$args);
		$apply = array_map(function($v) use(&$args){
			if ($v instanceof Placeholder)
				return array_shift($args);
			return $v;
		},$apply);
		return $fn(...$apply);
	};
}
function compose(...$fns) {
    $prev = array_shift($fns);
    foreach ($fns as $fn){
        $prev = function(...$args) use ($fn, $prev) {
            return $prev($fn(...$args));
        };
    }
    return $prev;
}