PHP类 处理漂亮整洁的URL 例如 http://www.huiff.com/a

<?php
class RequestPath{
    private $parts=array(); //存储请求URL的所有部分
         
    /********
        函数名  ：__construct()
        函数功能 ：构造函数负责实际路径的解析
        e.g : http://域名/网页/动作/动作类型/参数１名称/参数１值/参数２名称/参数２值...
        e.g : http://www.huiff.com/RequestPath.class.php/edit/trackbacks/page/2/flag/4
    *********************************************************************************************/
    public function __construct()
    {
        if(isset($_SERVER['PATH_INFO']))
        {
            $path= (substr($_SERVER['PATH_INFO'],-1) == '/') ? substr($_SERVER['PATH_INFO'],0,-1) :$_SERVER['PATH_INFO'];
        }
        else
        {
            $path= (substr($_SERVER['REQUEST_URI'],-1) == '/') ? substr($_SERVER['REQUEST_URI'],0,-1) : $_SERVER['REQUEST_URI'];  
        } 
        $bits             = explode('/',substr($path,1));
        $parsed['action'] = array_shift($bits); //将数组头部移出数组
        $parsed[]         = $parsed['action'];
        $parsed['type']   = array_shift($bits); //将数组头部移出数组
        $parsed[]         = $parsed['type'];      
        $parts_size=sizeof($bits);
        if($parts_size % 2 != 0)
        {
            $parts_size -=1;  
        }
        for( $i = 0 ; $i < $parts_size ; $i += 2 )
        {
            $parsed[$bits[$i]] = $bits[$i+1];
            $parsed[]          = $bits[$i+1]; 
        }
        if(sizeof($bits) % 2 !=0)
        {
            $parsed[] = array_pop($bits); 
        }
        $this->parts = $parsed;
    } 
         
    /***********************************************************************************************
    函数名   ：__get  __set __isset
    函数功能 ：以下函数分别为获取，设置，和测试路径元素植       
    参数$key ：参数名称             
    ***********************************************************************************************/
    public function __get($key)
    {
        return $this->parts[$key]; 
    }
    public function __set($key , $value)
    {
        $this->parts[$key]=$value; 
    } 
    public function __isset($key)
    {
        return isset($this->parts[$key]);  
    } 
}
  
//这里是运用
$url = new RequestPath();
echo "action = ".$url->__get('action')."
";
echo "type = ".$url->__get('type')."
";
echo "page = ".$url->__get('page')."
";
echo "index = ".$url->__get('index')."
";
echo "aa = ".$url->__get('aa')."
";
?>