(PHP 4, PHP <=5.2.0)
Open persistent Informix connection
resource ifx_pconnect ([ string $database [, string $userid [, string $password ]]] )
ifx_pconnect() acts very much like ifx_connect() with two major differences.
First, when connecting, the function would first try to find a (persistent) link that's already open with the same host, username and password. If one is found, an identifier for it will be returned inst