thank for your time,
no error message, methods work well, juste the second wait the first is finished. methods seems go to a queue. the boths return the result i want.
I juste tried the solution in your link, but this give me an error : NetStatusEvent non pris en charge : level=error, code=NetConnection.Call.BadVersion
genrally, this error can result from a syntax error in php, but all seems ok, i juste add the line:
$gateway->setBaseClassPath(realpath("services/") . "/");
I think too i don't need multiple netconnections, but i don't think the problem come from here.