<?php

// Vgl. http://de.wikipedia.org/wiki/Delegat_%28.NET%29#Beispiel_in_Visual_C.23

namespace X
{
    use Closure;

    abstract class Delegate
    {
        protected $closure;

        public function __construct(Closure $closure)
        {
            $this->closure = $closure;
        }

        public function __invoke()
        {
            return call_user_func_array($this->closure, func_get_args());
        }
    }
}

namespace Wikipedia\DelegateSample
{
    use X\Delegate;

    class MyStringDelegate extends Delegate {}

    class MainClass
    {
        public static function main()
        {
            $mc = new MainClass();

            $delegateUpper = new MyStringDelegate(function ($s) use ($mc) {
                return $mc->upperFunction($s); });

            $delegateLower = new MyStringDelegate(function ($s) use ($mc) {
                return $mc->lowerFunction($s); });

            self::doSomething($delegateUpper, 'Hello World');

            self::doSomething($delegateLower, 'Hello World');
        }

        public static function doSomething(MyStringDelegate $delegate, $input)
        {
            echo $delegate($input), "\n";
        }

        public function upperFunction($s)
        {
            return mb_strtoupper($s);
        }

        public function lowerFunction($s)
        {
            return mb_strtolower($s);
        }
    }

    MainClass::main();
}