(PHP 4, PHP <=5.2.0)
Open Informix server connection
resource ifx_connect ([ string $database [, string $userid [, string $password ]]] )
ifx_connect() establishes a connection to an Informix server.
In case a second call is made to ifx_connect() with the same arguments, no new link will be established, but instead, the link identifier of the already opened link will be returned.
The link to the server will be closed