named parameters in php

closure.php

<?
namespace closure;

class name {
    public static function parameter($f){
        $ref = new \ReflectionFunction($f);
        $underlying = [];
        foreach($ref->getParameters() as $param){ 
            $underlying[$param->getName()] = null;
        }
        return function($args) use($f, $underlying){
            $values = array_merge($underlying, $args);
            return call_user_func_array($f, array_values($values));
        };  
    }   
} 

NamedParameterTest.php

<?
include_once 'closure.php';
use closure\name;

class NamedParameterTest extends PHPUnit_Framework_TestCase{
    public function test_named_parameter(){
        
        $increment = name::parameter(function($x, $y, $z){
            return [$x+1, $y+1, $z+1];
        });
        $values = $increment([ 
            'z' => 2, 
            'y' => 1,
            'x' => 0,
        ]);
        $this->assertSame([1,2,3], $values);
    }
}