注意:类mysqli_result的对象无法转换为int，并且警告:mysqli_num_rows(）要求参数1为mys

代码用于在数据库中插入用户数据出现错误

$run = mysqli_query($con,$check_email);

注意：mysqli_result类的对象无法转换为int

和

警告：mysqli_num_rows（）要求参数1为mysqli_result，布尔

    <?php
    $con = mysqli_connect("localhost","root","","users_db");
    if (mysqli_connect_errno())
    {
    echo 'connection was not established'. mysqli_connect_error();
    }
        if(isset($_POST['submit'])){
             $user_name = $_POST['name'];
             $user_pass = $_POST['pass'];
             $user_email = $_POST['email'];
             if($user_name==''){
                 echo "<script>alert('please Enter your Nmae!')</script>";
                 exit();
             }
             if($user_pass==''){
                 echo "<script>alert('please Enter your password!')</script>";
                 exit();
             }
             if($user_email==''){
                 echo "<script>alert('please Enter your Email!')</script>";
                 exit();
             }
                 $check_email = "select * from users where user_email='$user_email'";
                $run = mysqli_query($con,$check_email);
                if(mysqli_num_rows($run>0)){
                    echo "<script>alert('Email $user_email is already exist in database please try another one')</script>";
                    exit();
                }
                $query = "insert into users(user_name,user_pass,user_email) values ('$user_name','$user_pass','$user_email')";
                if(mysqli_query($con,$query)){
                    echo "<script>alert('Registration completed')</script>";
                }
                else{
                    echo"<script>alert('Data not inserted')</script>";
                }
             }  
    ?>