Question

继承我在PHP中的代码，

见文字

if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
    include 'DatabaseConfig.php';

    $con = mysqli_connect($HostName, $HostUser, $HostPass, $DatabaseName);
    $Email = $_POST['User_Email'];
    $Password = $_POST['User_Password'];
    $Full_Name = $_POST['User_Full_Name'];
    $CheckSQL = "SELECT * FROM register_account WHERE User_Email='$Email'";
    $check = mysqli_fetch_array(mysqli_query($con, $CheckSQL));
    if (isset($check))
    {
        echo 'Email Already Exist, Please Enter Another Email.';
    }
    else
    {
        $Sql_Query = "INSERT INTO register_account values(User_Email,User_Password,User_Full_Name) values ('$Email','$Password','$Full_Name')";
        if (mysqli_query($con, $Sql_Query))
        {
            echo 'User Registration Successfully';
        }
        else
        {
            echo 'Something went wrong';
        }
    }
}

mysqli_close($con);

这是我尝试在浏览器上查看时的错误

Notice: Undefined variable: con in C:\xampp\htdocs\android\User-Registration.php on line 36

Warning: mysqli_close() expects parameter 1 to be mysqli, null given in C:\xampp\htdocs\android\User-Registration.php on line

我已经多次检查我的数据库和代码，但似乎仍然没有工作。有人可以帮帮我吗？谢谢！

Answer 1

好吧，检查您的代码：如果mysqli_connect请求发生，您只是在运行POST，但在每个请求中都运行mysqli_close

Answer 2

<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {

    include 'DatabaseConfig.php';

    $con = mysqli_connect($HostName, $HostUser, $HostPass, $DatabaseName);

    $Email = $_POST['User_Email'];

    $Password = $_POST['User_Password'];

    $Full_Name = $_POST['User_Full_Name'];

    $CheckSQL = "SELECT * FROM register_account WHERE 
       User_Email='$Email'";

    $check = mysqli_fetch_array(mysqli_query($con, $CheckSQL));

    if (isset($check)) {

        echo 'Email Already Exist, Please Enter Another Email.';

    } else {
        $Sql_Query = "INSERT INTO register_account 
      values(User_Email,User_Password,User_Full_Name) values 
     ('$Email','$Password','$Full_Name')";

        if (mysqli_query($con, $Sql_Query)) {
            echo 'User Registration Successfully';
        } else {
            echo 'Something went wrong';
        }
    }
    mysqli_close($con);
}
?>

PHP连接到xampp失败

2 个答案: