How to make friends Facebook Log in code with Google log in code

I have two snippets of code that are each responsible for logging in from their social networks are Facebook and Google.

//GOOGLE
if(isset($_GET['code'])) {

    $token = $google_client->fetchAccessTokenWithAuthCode($_GET["code"]);

    //This condition will check there is any error occur during geting authentication token. If there is no any error occur then it will execute if block of code/
    if (!isset($token['error'])) {
        //Set the access token used for requests
        $google_client->setAccessToken($token['access_token']);

        //Store "access_token" value in $_SESSION variable for future use.
        $_SESSION['access_token'] = $token['access_token'];

        //Create Object of Google Service OAuth 2 class
        $google_service = new Google_Service_Oauth2($google_client);

        //Get user profile data from google
        $data = $google_service->userinfo->get();
        if (!empty($data['sub'])) {
            $_SESSION['user_id'] = $data['sub'];
        }
        if (!empty($data['given_name'])) {
            $_SESSION['user_name'] = $data['given_name'] . " " . $data['family_name'];
        }
        if (!empty($data['email'])) {
            $_SESSION['user_email_address'] = $data['email'];
        }
        if (!empty($data['picture'])) {
            $_SESSION['user_image'] = $data['picture'];
        }
    }
}

//FACEBOOK
$facebook_helper = $facebook->getRedirectLoginHelper();

if(isset($_GET['code'])) {
    if (isset($_SESSION['access_token'])) {
        $access_token = $_SESSION['access_token'];
    } else {
        $access_token = $facebook_helper->getAccessToken();
        $_SESSION['access_token'] = $access_token;
        $facebook->setDefaultAccessToken($_SESSION['access_token']);
    }

    $graph_response = $facebook->get("/me?fields=name,email", $access_token);
    $facebook_user_info = $graph_response->getGraphUser();

    if (!empty($facebook_user_info['id'])) {
        $_SESSION['user_image'] = 'http://graph.facebook.com/' . $facebook_user_info['id'] . '/picture';
    }
    if (!empty($facebook_user_info['id'])) {
        $_SESSION['user_id'] = $facebook_user_info['id'];
    }
    if (!empty($facebook_user_info['name'])) {
        $_SESSION['user_name'] = $facebook_user_info['name'];
    }
    if (!empty($facebook_user_info['email'])) {
        $_SESSION['user_email_address'] = $facebook_user_info['email'];
    }
} else {
    // Get login url
    $facebook_permissions = ['email']; // Optional permissions
    $facebook_login_url = $facebook_helper->getLoginUrl('https://2goe.com/demo/'.$lang.'/home/', $facebook_permissions);
}

When they are together, then:

1. When you click Google log in, redirectURL responds with server error 500.
2. And Facebook does not return user data, which is requested in the code.

But if, for example, you delete the code of one of the social networks, it individually works fine. I myself tried to somehow paint 2 codes into one code, but to no avail. I also split them into different files, but this also did not bring any results.

Can you please help me somehow combine them correctly so that there are no such conflicts between them.

The issue you are having is that you are setting things with the same session names. $_GET['code'] could be facebook or google there is no way for you to know which one it is.

The easiest solution would be to run the google code first. Then alter the if statement for Facebook a little.

If you do something like this the code for facebook will look for a code find a code but it will also look for an error from Google. If google spit back an error then you try the code with facebook. If it did not return an error then you know the code was most likely used by Google.

if(isset($_GET['code'] && isset($token['error'])) {