2015-08-10 04:55
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简单的PHP登录表单返回'0'mysqli_num_rows。 我的代码逻辑出了什么问题?

Trying to create simple PHP login form that takes 'username' and 'password', if matched with 'dbusername' and 'dbpassword' the code should echo "You're Logged In!.

When I run the code, I get no errors.The page goes from login.php to process.php but shows a blank page. Doesn't show: echo "Incorrent username or password!" or "You're Logged In!".

I checked to see if its returning any rows from database. I'm getting 0 rows. But why?! Is my code logic incorrect? Because my database connection works AND I have a username: alex and password: abc in my database named phplogin and in table users


$username = $_POST['username'];
$password = $_POST['password'];

$servername = 'localhost';
$username = 'root';
$password = '';
$dbname = 'phplogin';

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());

$sql = "SELECT *
                      FROM users
                      WHERE username = '".$username."'
                      AND password = '".$password."'";

$result = mysqli_query($conn, $sql);

echo mysqli_num_rows($result); //   I Checked to see if I was getting no rows. *I am getting 0 rows!!* But why?!

if (mysqli_num_rows($result) > 0) {
    // output data of each row
    while($row = mysqli_fetch_assoc($result)) {

        $dbusername = $row['username'];
        $dbpassword = $row['password'];

        //check to see if the match

if($username == $dbusername && $password == $dbpassword ) {

        echo "You're Logged In!";

 } if($username != $dbusername || $password != $dbpassword) {
        echo "Incorrect password or username!";
} else {
        die("That user doesn't exist!");




Here is my login.php page [form]


    <form action="process.php" method="POST">
    Username:   <input type="text" name="username"><br>
    Password:   <input type="password" name="password"><br>
        <input type="submit" value="Log In"><br>


Any ideas?

UPDATE 1: The issue was with my variables conflicting with database.

Now I am getting the following once I login and it has to do with the last statement on my process.php page:

enter image description here

Why is the final else statement printing on screen when Its logging in?

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