Router

<?php

class Router{

    private $core;
    private $get;
    private $post;

    private function __construct(){}

    public static function getInstance(){

        static $inst = null;
        if($inst === null){
            $inst = new Router();
        }
        return $inst;
    }

    public function load(){
        $this->core = Core::getInstance();
        $this->loadRouteFile('default');
        return $this;
    }
    
    public function loadRouteFile($f){
        if(file_exists('routes/' . $f . '.php')){
            require 'routes/' . $f . '.php';
        }
    }

    public function match(){
        $url = (isset($_GET['url']) ? $_GET['url'] : '');
        switch ($_SERVER['REQUEST_METHOD']) {
            case 'GET':
                $type = $this->get;
                break;
            case 'POST':
                $type = $this->post;
            break;
        }

        foreach($type as $pt => $function){
            $pattern = preg_replace('(\{[a-z0-9]{0,}\})', '([a-z0-9]{0,})', $pt);

            if (preg_match('#^('. $pattern .')*$#i', $url, $matches) === 1) {

                array_shift($matches);
                array_shift($matches);

                $itens = array();
                if(preg_match_all('(\{[a-z0-9]{0,}\})', $pt, $mt)){
                    $itens = preg_replace('(\{|\})', '', $mt[0]);
                }

                $arg = array();
                foreach($matches as $key => $match){
                    $arg[$itens[$key]] = $match;
                }


                $function($arg);
                break;
            }
        }
    }

    private function get($pattern, $function){
        $this->get[$pattern] = $function;     
    }

    private function post($pattern, $function){
        $this->post[$pattern] = $function;
    }
}