<?php

function curry() {
    $curryArgs = func_get_args();
    return function() use ($curryArgs){
        $function = array_shift($curryArgs);
        $mergedArgs = array_merge($curryArgs, func_get_args());
        return call_user_func_array($function, $mergedArgs);
    };
}


$multiply = function($x, $y) {
    return $x * $y;
};

$multiplyBy4 = curry($multiply, 4);

echo $multiplyBy4(2); // Echo: 8