## Installation

The process of installing OPcache varies depending on which version of PHP you're running. Please refer to the appropriate section below.

> Note:

> If you want to use OPcache with » Xdebug, you must load OPcache before Xdebug.

### PHP 5.5.0 and later

OPcache can only be compiled as a shared extension. If you have disabled the building of default extensions with --disable-all, you must compile PHP with the --enable-opcache option for OPcache to be available.

Once compiled, you can use the zend_extension configuration directive to load the OPcache extension into PHP. This can be done with `zend_extension=/full/path/to/opcache.so` on non-Windows platforms, and `zend_extension=C:\path\to\php_opcache.dll` on Windows.

### PHP 5.2, 5.3 and 5.4

This » PECL extension is not bundled with PHP.

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: » https://pecl.php.net/package/ZendOpcache.

A DLL for this PECL extension is currently unavailable. See also the building on Windows section.

### Recommended php.ini settings

The following settings are generally recommended as providing good performance:

    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

You may also want to consider disabling opcache.save_comments and enabling opcache.enable_file_override, however note that you will have to test your code before using these in production as they are known to break some frameworks and applications, particularly in cases where documentation comment annotations are used.

On Windows, opcache.file_cache_fallback should be enabled, and opcache.file_cache should be set to an already existing and writable directory.

A full list of configuration directives supported by OPcache is also available.