How to install the ZendOptimizerPlus (aka OPcache) PHP extension with older PHP versions (5.2.x, 5.3.x, 5.4.x)

ZendOptimizerPlus (OPcache) is an opcode cache which is already part of PHP5.5. If you are using an older PHP version, it can be interesting to install it on your server.

Installation of required package

Download of the upstream source (here, I'm using the last master branch state)

Unzip of the upstream source

Configuration, compilation and installation

Last output should be (which give you the path of the opcache extension)

Creation of the file /etc/php5/mods-available/opcache.ini with the following content

Activation of the OPcache extension

Result (here on Ubuntu Raring)

Note: The OPcache extension helps to speed up PHP applications, but also, this allow to reduce the memory usage. For instance, during my tests, the memory used for the panel (which was run through Nginx and PHP5.4.9 as a FastCGI application) has been halved.

Enjoy

@remontti

You are kidding?

It's clearly stated in the howto that the opcache.ini file must be created. Next time follow the step correctly and this will work.

Quote from Nuxwin

Creation of the file /etc/php5/mods-available/opcache.ini with the following content
Source Code
zend_extension=/usr/lib/php5/20100525+lfs/opcache.so