Information for installing this PECL extension may be found in the manual chapter titled Installation of PECL extensions. Additional information such as new releases, downloads, source files, maintainer information, and a CHANGELOG, can be located here: » http://pecl.php.net/package/rdkafka
Linux, Unix, and OS X users may run the following command to install the extension:
$ sudo pecl install rdkafka
Add the following line to your php.ini file:
extension=rdkafka.so