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# LXIII. Informix Functions (PDO_INFORMIX)

# Introduction

PDO_INFORMIX is a driver that implements the PHP Data Objects (PDO) interface to enable access from PHP to Informix databases.

# Installation

To build the PDO_INFORMIX extension, the Informix Client SDK 2.81 UC1 or higher must be installed on the same system as PHP. The Informix Client SDK is available from the IBM Informix Support Site.

PDO_INFORMIX is a PECL extension, so follow the instructions in Chapter 7 to install the PDO_INFORMIX extension. Issue the configure command to point to the location of your Informix Client SDK header files and libraries as follows:

    bash$ ./configure --with-pdo-informix=/path/to/SDK[,shared]

The configure command defaults to the value of the INFORMIXDIR environment variable.

# Scrollable cursors

PDO_INFORMIX supports scrollable cursors; however, they are not enabled by default. To enable scrollable cursor support, you must either set `ENABLESCROLLABLECURSORS=1` in the corresponding ODBC connection settings in `odbc.ini` or pass the `EnableScrollableCursors=1` clause in the DSN connection string.

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