The PHP PDO (PHP Data Object) driver for IBM Informix IDS has been released on 2005-12-14 as a source code version and is available directly from the PHP PECL site at: http://pecl.php.net/package/PDO_INFORMIX.
To ease the deployment of the driver, IIUG has delivered a binary version of the DLL (php_pdo_informix.dll). There is no guarantee coming with the product, but it might help quite a few users, until PHP ships the driver in its standard package.
The package is available on the IIUG Software Repository and contains a standard DLL and a debug DLL with traces.
The repository news item for the PHP PDO Driver can be found here:
http://www.iiug.org/software/repository_news.html
Download the Driver from here:
http://www.iiug.org/software/index_all.html#php_pdo_informix