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function I($name,$default='',$filter=null,$datas=null) {
    if(strpos($name,'.')) { // 指定参数来源
        list($method,$name) =   explode('.',$name,2);
    }else{ // 默认为自动判断
        $method =   'param';
    }
    switch(strtolower($method)) {
        case 'get'     :   $input =& $_GET;break;
        case 'post'    :   $input =& $_POST;break;
        case 'put'     :   parse_str(file_get_contents('php://input'), $input);break;
        case 'param'   :
            switch($_SERVER['REQUEST_METHOD']) {
                case 'POST':
                    $input  =  $_POST;
                    break;
                case 'PUT':
                    parse_str(file_get_contents('php://input'), $input);
                    break;
                default:
                    $input  =  $_GET;
            }
            break;
        case 'path'    :   
            $input  =   array();
            if(!empty($_SERVER['PATH_INFO'])){
                $depr   =   C('URL_PATHINFO_DEPR');
                $input  =   explode($depr,trim($_SERVER['PATH_INFO'],$depr));            
            }
            break;
        case 'request' :   $input =& $_REQUEST;   break;
        case 'session' :   $input =& $_SESSION;   break;
        case 'cookie'  :   $input =& $_COOKIE;    break;
        case 'server'  :   $input =& $_SERVER;    break;
        case 'globals' :   $input =& $GLOBALS;    break;
        case 'data'    :   $input =& $datas;      break;
        default:
            return NULL;
    }
    if(''==$name) { // 获取全部变量
        $data       =   $input;
        array_walk_recursive($data,'filter_exp');
        $filters    =   isset($filter)?$filter:C('DEFAULT_FILTER');  //默认会用htmlspecialchars过滤
        if($filters) {
            if(is_string($filters)){
                $filters    =   explode(',',$filters);
            }
            foreach($filters as $filter){
                $data   =   array_map_recursive($filter,$data); // 参数过滤
            }
        }
    }elseif(isset($input[$name])) { // 取值操作
        $data       =   $input[$name];
        is_array($data) && array_walk_recursive($data,'filter_exp');
        $filters    =   isset($filter)?$filter:C('DEFAULT_FILTER');
        if($filters) {
            if(is_string($filters)){
                $filters    =   explode(',',$filters);
            }elseif(is_int($filters)){
                $filters    =   array($filters);
            }
            
            foreach($filters as $filter){
                if(function_exists($filter)) {
                	//进入这里如果是数组会有TP自己的回调函数对数据进行处理，如果不是会直接用htmlspecialchars过滤
                    $data   =   is_array($data)?array_map_recursive($filter,$data):$filter($data); // 参数过滤
                }else{
                    $data   =   filter_var($data,is_int($filter)?$filter:filter_id($filter));
                    if(false === $data) {
                        return   isset($default)?$default:NULL;
                    }
                }
            }
        }
    }else{ // 变量默认值
        $data       =    isset($default)?$default:NULL;
    }
    return $data;
}

function array_map_recursive($filter, $data) {
     $result = array();
     foreach ($data as $key => $val) {
         $result[$key] = is_array($val)
             ? array_map_recursive($filter, $val)
             : call_user_func($filter, $val);
     }
     return $result;
 }