Supposing you are using XAMPP for Windows 1.8.x, you will feel curious about where ZendOpcache module is sitting. It's not there and you'll need to download it yourself.
Opcode caching is a good way to improve PHP performance as it takes out the compiling time of PHP source code for each consecutive loading after the first time that piece of PHP script is loaded and served.
Here're the steps:
1. Please download the package (version as of today is 7.0.4) via the following link:
http://windows.php.net/downloads/pecl/releases/opcache/7.0.4/php_opcache-7.0.4-5.4-ts-vc9-x86.zip
2. Stop Apache Service.
3. Download and extract the library file “php_opcache.dll” and copy it into the directory “C:\xampp\php\ext\”.
4. Add the following lines (marked in red) to the end of PHP configuration file:
. . . C:\xampp\php\php.ini … ; ; set in php ini file only ; ; make sure it's readable (open_basedir is checked) by coverage viewer script ; xcache.coveragedump_directory = "" ; ;; END OF XCACHE CONFIG [Zend_Opcache] zend_extension = "C:\xampp\php\ext\php_opcache.dll" opcache.memory_consumption=128 opcache.interned_strings_buffer=8 opcache.max_accelerated_files=4000 opcache.revalidate_freq=60 opcache.fast_shutdown=1 opcache.enable_cli=1 . . .
5. Start Apache service.
6. Examine and check if the libraries are loading properly via http://localhost/xampp/phpinfo.php
