IBM® Informix® supports database access for client applications that are written in the PHP programming language by using a PDO (PHP Data Object) extension that functions as a database extraction layer. Two open source PDO extensions are available for Informix: the PDO for Informix and the PDO for Data Server clients.
The PDO extension for Informix is called PDO_INFORMIX. It works only with connections to Informix. You can download PDO_INFORMIX from the PHP Extension Community Library (PECL) website at http://pecl.php.net/package/PDO_INFORMIX.
To use PDO_INFORMIX, you must install the IBM Informix ODBC Driver, which is part of the IBM Informix Client Software Development Kit (Client SDK).
Documentation to build and use PDO_INFORMIX is available from the php.net website:http://us2.php.net/manual/en/ref.pdo-informix.php.
The PDO extension for IBM Data Servers is called PDO_IBM and is supported on Informix 11.10, or later. PDO_IBM can be used for connections to both Informix and DB2® data servers.
You can download PDO_IBM from the PHP Extension Community Library (PECL) website at http://pecl.php.net/package/PDO_IBM.
Documentation to build and use PDO_INFORMIX is available from php.net website: http://us2.php.net/manual/en/ref.pdo-ibm.php.