How can the PHP code be modified to allow users to log in with their username and password correctly?

The PHP code needs to check if the username and password entered by the user match the credentials stored in the database. This can be done by querying the database for the user's information and comparing the password hash. If the credentials match, the user can be successfully logged in. 

// Check if the form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Retrieve the username and password from the form
    $username = $_POST['username'];
    $password = $_POST['password'];

    // Query the database for the user's information
    $query = "SELECT * FROM users WHERE username = '$username'";
    $result = mysqli_query($conn, $query);
    
    // Check if the user exists and the password is correct
    if ($result && mysqli_num_rows($result) > 0) {
        $user = mysqli_fetch_assoc($result);
        if (password_verify($password, $user['password'])) {
            // Password is correct, log in the user
            // Add your login logic here
        } else {
            // Password is incorrect
            echo "Invalid password";
        }
    } else {
        // User does not exist
        echo "User not found";
    }
}

Keywords

PHP login username password authentication modification

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