$datas =  array( 
        'grant_type' => 'authorization_code',
        'code' => $sanitized_authcode,
        'redirect_uri' => 'http://chemindeleau.com/callback_openid.php',
    );
    
    $client_id = 'chemin_openid'; 
    $client_secret = '01fc458';   

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);      
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    curl_setopt($ch, CURLOPT_USERPWD, "{$client_id}:{$client_secret}");
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded'));
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($datas));
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);