function alter_promo($promoid)
{
$promo = new Promo($promoid);
// We'll need to parse the PUT body to get our arguments
$params = file_get_contents("php://input", "r");
$putParams = array();
while (preg_match("/&/", $params)) {
$param = strstr($params, "&", true);
$params = substr(strstr($params, "&"), 1);
$putParams[strstr($param, "=", true)] = substr(strstr($param, "="), 1);
}
// We need it one more time for the last argument
$param = $params;
$putParams[strstr($param, "=", true)] = substr(strstr($param, "="), 1);
$promo->setLibelle($putParams["libelle"]);
$promo->write();
}