如何使用mysql在php中登录时使用idtokens验证用户并使用Firebase验证idid？

Question

I am creating user sign and up with MySQL, PHP and I want to authenticate user account with firebase and create id token and verify the account with the help of firebase? I am new in firebase

I already created a user login form but how to connect firebase with myself. I am not getting.

include("include/db.php");

 if(isset($_POST['signup'])){

    $email = $_POST['emailSignup'];
    $pass = $_POST['passSignup'];

    $auth = $firebase->getAuth();
    $user = $auth->createUserWithEmailAndPassword($email,$pass);
    header("Location:index.php");
}