Enabling PHP APC for Apache on Ubuntu 15.04 Vivid Linux
How to Install and Enable the Latest PHP Pecl APC Extension for the Apache Web Server on Ubuntu 15.04 Vivid Vervet GNU+Linux i386/amd64 Server/Desktop.
The Best Way to Install the APC Module is to Provide Directly to Download, Compile and Install from Source the Latest Pecl APC Release.
To the Article Top there is a Link to Guide on How to Enable the Needed PECL Command for Ubuntu.
The Alternative PHP Cache (APC) is a free and open opcode cache for PHP. Its goal is to provide a free, open, and robust framework for caching and optimizing PHP intermediate code.
APC is a framework that caches the output of the PHP bytecode compiler in shared memory, thus Reducing Parsing and Disk I/O overhead for later requests; and a shared memory cache for user data.