Installing PHP
PHP (without Informix) is usually available on most Linux and Apache installations using ODBC.
Configuring PHP to use Informix is NOT a cakewalk.
Requires use of ESQL/C libraries to compile (free w/Client SDK).
Don’t reuse previous versions of Apache httpd.conf if you are upgrading Apache from a earlier version.
If you want the database to reside in a machine separate from the web server, you will need Informix Client SDK or I-Connect on the web server.
If you're using I-Connect on the deployment machine, you must compile on a machine with ClientSDK installed. And CSDK and I-Connect need to be in the same directory on the two different machines.