php获取前端提交数据类：支持危险数据过滤

/**
* @desc：获取前端提交的数据，支持数据过滤
* @author [Lee] <[]>
*/
class getrequest{
/*
 @desc：内部函数：过滤危险数据
 */
private function safetydata($data){
    foreach($data as $k=>$v){
        if(is_array($v)){
            $data[$k] = $this->safetydata($v);
        }else{
            $tmp = trim($v);
            $tmp = addslashes($tmp);
            $data[$k] = $tmp;
        }
    }
    return $data;
}
/*
 @desc：判断前端传入方式，转换成能用数据
 */
public function getrequestdata(){
    $data;
    $ret;
    $contenttype = strtolower($_SERVER['CONTENT_TYPE']);
    $method = strtolower($_SERVER['REQUEST_METHOD']);
    if($contenttype == 'application/json'){
        $data = file_get_contents('php://input');
        $data = json_decode($data,true);
    }elseif(in_array($contenttype,array('application/x-www-form-urlencoded','multipart/form-data')) || $method == 'post'){
        $data = $_POST;
    }elseif(in_array($contenttype,array('application/x-www-form-urlencoded','multipart/form-data')) || $method == 'get'){
        $data = $_GET;
    }else{
        parse_str(file_get_contents('php://input'),$data);
    }
    $ret = $this->safetydata($data);
    return $ret;
}
}

$getrequest = new getrequest();
$data = $getrequest->getrequestdata();
var_dump($data);