Bonjour apres plusieurs recherches  j'ai réussi a mettre en place un systeme de login steam cependant mon code pour l'ajouter dans la bdd lors de la connexion ne fonctionne pas pourriez-vous m aider j'utilise cette librairie

https://github.com/SmItH197/SteamAuthentication

if (isset($_GET['login'])){
	require 'openid.php';
	try {
		require 'SteamConfig.php';
		$openid = new LightOpenID($steamauth['domainname']);

		if(!$openid->mode) {
			$openid->identity = 'http://steamcommunity.com/openid';
			header('Location: ' . $openid->authUrl());
		} elseif ($openid->mode == 'cancel') {
			echo 'User has canceled authentication!';
		} else {
			if($openid->validate()) {
				$id = $openid->identity;
				$ptn = "/^http:\/\/steamcommunity\.com\/openid\/id\/(7[0-9]{15,25}+)$/";
				preg_match($ptn, $id, $matches);
				/*J'enregistre l'utilisateur sur la bdd */
				foreach ($json_decoded->response->players as $player)
				{
					$sql_fetch_id = "SELECT * FROM users_steam WHERE steamid = $player->steamid";
					$query_id = mysqli_query($db, $sql_fetch_id);
					if (mysqli_num_rows($query_id) == 0) {
						$sql_steam = "INSERT INTO users_steam(name, steamid, avatar) VALUES('$player->personaname','$player->steamid','$player->avatar')";
					}
				}
				/* fin enregistrement*/
				$_SESSION['steamid'] = $matches[1];
				if (!headers_sent()) {
					header('Location: '.$steamauth['loginpage']);
					exit;
				} else {
					?>
					<script type="text/javascript">
						window.location.href="<?=$steamauth['loginpage']?>";
					</script>
					<noscript>
						<meta http-equiv="refresh" content="0;url=<?=$steamauth['loginpage']?>" />
					</noscript>
					<?php
					exit;
				}
			} else {
				echo "User is not logged in.\n";
			}
		}
	} catch(ErrorException $e) {
		echo $e->getMessage();
	}
}