Question

致命错误：未捕获错误：在C：\ xampp \ htdocs \ project \ class.php：16中调用null成员函数query（）堆栈跟踪：＃0 C：\ xampp \ htdocs \ project \ register。 php（6）：reg-> registration（'SAFDFD'，'fcec3612a0103be ...'，'ASF@DGGG.H'）＃1 {main}在C：\ xampp \ htdocs \ project \ class.php中抛出16

我是初学者。请输入您关于此错误的信息。

register.php

  include "class.php"; 
  $user = new reg();
  if (isset($_POST['submit'])){
   extract($_POST);
   $register = $user->registration($uname,$password,$email);
   if($register){
     echo "added";
}else{
     echo "error";
   }
  }
 ?>
<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
  </head>
  <body>
    <form action="" method="post">
      User Name:<input type="text" name="uname">
      Password: <input type="password" name="password">
      Email:<input type="email" name="email">
      <button name="submit">submit</button>
    </form>
  </body>
</html>

class.php

 include ('db.php');
  class reg{
  protected $db;

 function __construct(){
$this->db = new db_connect();
   $this->db = $this->db->return_obj();    

 }

 public function registration($uname,$password,$email){

    $password = md5($password);
    $query = "SELECT * from user where username = '$uname' OR email ='$email'";
$result = $this->db->query($query) or die($this->db->error);
$count = $result->num_rows;

if ($count ==0){
  $query ="INSERT into user where username = '$uname' and email = '$email' and password='$password'";
  $result =$this->db->query($query) or die ($this->db->error);
  return true;
  }else{
   return false;
}

致命错误：未捕获错误：调用成员函数query（）

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