Spero di no.

Ho trovato questo http://it.php.net/manual/en/function...-thread-id.php

int mysql_thread_id ( [resource link_identifier])

mysql_thread_id() returns the current thread ID. If the connection is lost and you reconnect with mysql_ping(), the thread ID will change. This means you should not get the thread ID and store it for later. You should get it when you need it.

Ma cosa si intende per thread ID? Potrebbe servire per il mio scopo?