最近着手写一个网站，从框架到应用全部重新开发，很多代码属于重造轮子，但主要的目的就是练手，因为发现最近思维有些固化了，是得好好从头到底写个项目了！

以前写的框架中路由功能非常有限，只是实现controller与action的选择，代码很简陋，没做过滤，安全性也有问题，所以就重写了一个路由。

框架出错提示

主要功能：

1. controller与action的选择
2. php正则rewrite美化url
3. 参数过滤
4. PATH_INFO与REQUEST_URI自动选择

代码如下

class router {
	
	static public $controller = '';
	static public $action     = '';
	static public $params     = array();
	
	static public function get() {
		$config = array(
						'controller_default'	=> 'index',
						'action_defalut'		=> 'index',
						'controller_delimiter'	=> '/',
						'action_delimiter'		=> '/',
						'params_delimiter'		=> '/',
						'params_kv_delimiter'	=> '/',
						'extension_default'		=> '.html',
					);
		if (false != $routerConfig = nash::config('main', 'router')) $config = array_merge($config, $routerConfig);
		
		//判断是否是GET形式
		if (isset($_GET['c']) || isset($_GET['a'])) {
			self::$controller = isset($_GET['c']) ? self::_filter($_GET['c']) : $config['controller_default'];
			self::$action = isset($_GET['a']) ? self::_filter($_GET['a']) : $config['action_defalut'];
			foreach ($_GET as $key => $value) {
				if (!in_array($key, array('c', 'a'))) self::$params[$key] = self::_filter($value);
			}
			return self::_output();
		}
		
		$queryString = isset($_SERVER['PATH_INFO']) ? self::_pathInfo() : self::_scriptName();
		$queryString = str_replace($config['extension_default'], '', $queryString);
		
		/********配置文件有rewrte规则时，对url进行改写**********/
		if (isset($config['rewrite']) && is_array($config['rewrite'])) $queryString = self::_rewrite($queryString, $config['rewrite']);
		
		/*******获取取controller******/
		if (false === $pos = stripos($queryString, $config['controller_delimiter'])) {
			self::$controller = empty($queryString) ? $config['controller_default'] : self::_filter($queryString);
			self::$action = $config['action_defalut'];
			return self::_output();
		}
		self::$controller = self::_filter(substr($queryString, 0, $pos));
		$queryString = substr($queryString, $pos+1);
		
		/*******获取取action******/
		if (false === $pos = stripos($queryString, $config['action_delimiter'])) {
			self::$action = empty($queryString) ? $config['action_defalut'] : self::_filter($queryString);
			return self::_output();
		}
		self::$action = self::_filter(substr($queryString, 0, $pos));
		$queryString = substr($queryString, $pos+1);
		if (empty($queryString)) return self::_output();
		
		/*******获取取params参数******/
		if (false === $pos = stripos($queryString, $config['params_kv_delimiter'])) {
			return self::_output();
		}
		
		//当params_kv_delimiter与params_delimiter两个分界符相同时
		if ($config['params_kv_delimiter'] == $config['params_delimiter']) {
			$array = explode($config['params_delimiter'], $queryString);
			$count = count($array);
			for ($i = 0; $i < $count; $i++) {
				if ($i%2 == 0) {
					self::$params[$array[$i]] = isset($array[$i+1]) && !empty($array[$i+1]) ? self::_filter($array[$i+1]) : '';
				}
			}
			return self::_output();
		}
		
		//当params_kv_delimiter与params_delimiter两个分界符不同
		if (false === $pos = stripos($queryString, $config['params_delimiter'])) {
			$array = explode($config['params_kv_delimiter'], $queryString);
			!empty($array[1]) && self::$params[$array[0]] = self::_filter($array[1]);
			return self::_output();
		}
		$array = explode($config['params_delimiter'], $queryString);
		foreach ($array as $value) {
			if (!empty($value)) {
				$arrayTmp = explode($config['params_kv_delimiter'], $value);
				!empty($arrayTmp[1]) && self::$params[$arrayTmp[0]] = self::_filter($arrayTmp[1]);
			}
		}
		return self::_output();
	}
	
	/**
	 * php实现的正则rewrite url
	 */
	static private function _rewrite($string, $regular) {
		return preg_replace (array_keys($regular), array_values($regular), $string);
	}
	
	/**
	 * 对参数进行过滤，防止注入攻击
	 */
	static private function _filter($value) {
		return filter::vars($value, '#s_z');
	}
	
	static private function _pathInfo() {
		$queryString = $_SERVER['PATH_INFO'] == '/' ? $_SERVER['PATH_INFO'] = '' : $_SERVER['PATH_INFO'];
		substr($queryString, 0, 1) == '/' && $queryString = substr($queryString, 1);
		return $queryString;
	}
	
	static private function _scriptName() {
		return substr(str_replace($_SERVER['SCRIPT_NAME'], '',$_SERVER['REQUEST_URI']),1);
	} 
	
	static private function _output() {
		return array(self::$controller, self::$action, self::$params);
	}
}
//$config = array('rewrite' => array('/user\/login\/(.*)/' => "user/login/url_$1"));
//var_dump(router::get());