我有两个错误，一个是mysqli_query，另一个是mysqli_fetch_array）：

Question

我正在创建一个网站，该网站根据用户选择的食谱生成购物清单。但是我在用户登录/会话密钥方面遇到问题。数据正在从数据库中推送/拉出，但随后出现错误

警告：mysqli_query（）希​​望参数2为字符串，在第32行的/opt/lampp/htdocs/GroceryBasket-Web/register.php中给出的对象

警告：mysqli_fetch_array（）期望参数1为mysqli_result，在第36行的/opt/lampp/htdocs/GroceryBasket-Web/register.php中给出的值为空

 <?php

 session_start();

  require_once('config.php');

  $conn = mysqli_connect(DBHOST,DBUSER,DBPASS,DBNAME);

    if(!$conn){
    die('could not connect' . mysqli_error());
  } 

echo 'CONNECTED TO DB';

  if(isset($_POST['login'])){
                //login
        $email = mysqli_real_escape_string($conn,$_POST['email']);
        $password = mysqli_real_escape_string($conn,$_POST['password']);
        $strSQL = mysqli_query($conn,"SELECT UserName from User_Info where Email='".$email."' and Password='".md5($password)."'");
        $Results = mysqli_fetch_array($strSQL);

        if(($Results)>=1) 
        {
                $message = $Results['UserName']." Login Sucessfully!!";
        }
        else
        {
            $message = "Invalid email or password!!";
        }     


        $qry = mysqli_query($conn, $strSQL);



        while($row=mysqli_fetch_array($qry)) {

        $dbemail = $row['email'];

        $dbpassword = $row['password'];

         if ($email == $dbemail && $password == $dbpassword) {

         $_SESSION['email'] = $email;

        header("location: home.php");

 }

}

     }
    elseif(isset($_POST['reg_user']))
    {                       //REGISTER
        $username      = mysqli_real_escape_string($conn,$_POST['username']);
        $email     = mysqli_real_escape_string($conn,$_POST['email']);
        $password  = mysqli_real_escape_string($conn,$_POST['password']);
        $query = "SELECT Email FROM User_Info where Email='".$email."'";
        $result = mysqli_query($conn,$query);
        $numResults = mysqli_num_rows($result);

        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) // Validate email address
        {
            $message =  "Invalid email address please type a valid email!!";
        }
        elseif($numResults>=1) 
        {
            $message = $email." Email already exist!!";
        }
        else
        {
            $qry= mysqli_query($conn,"INSERT into User_Info(Email,UserName,Password) VALUES('".$username."','".$email."','".md5($password)."')");

            if($qry) {

            $_SESSION['email'] = $email;

            header("location: home.php");

                }
            $message = "Signup Sucessfully!!";
        }
    }


?>