PHP Functional Currying

Curry.php

<?php

function __curry($callback, Reflector $reflector = null, $arguments = array(), $numArgs = null)
{
    if ( ! $reflector) {
        $reflector = new ReflectionFunction($callback);
    }
    
    if ($numArgs === null) {
        $numArgs = $reflector->getNumberOfRequiredParameters();
    }

    return function () use ($callback, $reflector, $arguments, $numArgs) {
        $arguments = array_merge($arguments, func_get_args());
        if (count($arguments) >= $numArgs) {
            return $reflector->invokeArgs($arguments);
        }
        return __curry($callback, $reflector, $arguments, $numArgs);
    };
}

$strpos = __curry('strpos');
$strposOfCurry = $strpos('curry');
var_dump($strposOfCurry('y')); // 4