(PECL yar >= 1.0.0)
Send all calls
public static boolean Yar_Concurrent_Client::loop ([ callable $callback [, callable $error_callback ]] )
Send all registed remote RPC calls.
Parameters:
callback
If this callback is set, then Yar will call this callback after all calls are sent and before any response return, with a $callinfo NULL.
Then, if user didn't specify callb