PDO_INFORMIX is a driver that implements the PHP Data Objects (PDO) interface to enable access from PHP to Informix databases.
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 Installation of PECL extensions to install the PDO_INFORMIX extension. Issue the configure command to point to the location of the Informix Client SDK header files and libraries as follows:
bash$ ./configure --with-pdo-informix=/path/to/SDK[,shared]
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.
Informix PDO needs the INFORMIXDIR system variable available to the script running under the webserver, in my case apache 2.4.
Using setenv did not work, so I added in the systemd startup script /lib/systemd/system/apache2.service the following:
Environment=INFORMIXDIR=/opt/Informix_Software_Bundle
in the [Service] section.
Of course, the installation directory of your informix libraries may be different than /opt/Informix_Software_Bundle....