Says hashed password is incorrect but they are the same : <p>Trying to learn a secure login so i was looking up tutorials. I found <a href="https://www.tutorialrepublic.com/php-tutorial/php-mysql-login-system.php" rel="nofollow noreferrer">this</a> tutorial useful and got a registration page working perfectly but the login keeps returning wrong password. 
This means its getting the username but is going wrong somewhere.</p>

<p>Any idea how i can fix this, whether you see the error or know of a way i can fix it?</p>

<p>Any help is appreciated </p>

<pre><code>// Check if username is empty
if(empty(trim($_POST["username"]))){
    $username_err = 'Please enter username.';
} else{
    $username = trim($_POST["username"]);
}

// Check if password is empty
if(empty(trim($_POST['password']))){
    $password_err = 'Please enter your password.';
} else{
    $password = trim($_POST['password']);
}

// Validate credentials
if(empty($username_err) &amp;&amp; empty($password_err)){
    // Prepare a select statement
    $sql = "SELECT username, password FROM users WHERE username = ?";

    if($stmt = mysqli_prepare($link, $sql)){
        // Bind variables to the prepared statement as parameters
        mysqli_stmt_bind_param($stmt, "s", $param_username);

        // Set parameters
        $param_username = $username;

        // Attempt to execute the prepared statement
        if(mysqli_stmt_execute($stmt)){
            // Store result
            mysqli_stmt_store_result($stmt);

            // Check if username exists, if yes then verify password
            if(mysqli_stmt_num_rows($stmt) == 1){                    
                // Bind result variables
                mysqli_stmt_bind_result($stmt, $username, $hashed_password);
                if(mysqli_stmt_fetch($stmt)){
                    if(password_verify($password, $hashed_password)){
                        /* Password is correct, so start a new session and
                        save the username to the session */
                        session_start();
                        $_SESSION['username'] = $username;      
                        header("location: welcome.php");
                    } else{
                        // Display an error message if password is not valid
                        $password_err = 'The password you entered was not valid.';
                    }
                }
            } else{
                // Display an error message if username doesn't exist
                $username_err = 'No account found with that username.';
            }
        } else{
            echo "Oops! Something went wrong. Please try again later.";
        }
    }

    // Close statement
    mysqli_stmt_close($stmt);
}

// Close connection
mysqli_close($link);
</code></pre>
