php传递post参数出现乱码怎么解决？

public function add(){
  $user = session("user_name");
  if(session("user_name")){
    //修改
    header("Content-Type:text/html;charset=utf8");
    //为
    echo '<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">';
    request.setCharacterEncoding("UTF-8");
    $common = D("Common");
    $data["user_id"] = $user[0]["user_id"];
    $data["user_name"] = $user[0]["user_name"];
    $data["pro_id"] = $_POST["pro_id"];
    $data["pro_name"] = $_POST["pro_name"];
    $data["pro_price"] = $_POST["pro_price"];
    $data["pro_num"] = $_POST["pro_num"];
    $data["pro_total"] = $_POST["pro_num"]*$_POST["pro_price"];
    dump($data);
    echo $data["pro_name"];
  }
}