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Please note that FlexiCache requires at least PHP 5.

For cache indexing, you should enable the SQLite extension (http://www.php.net/manual/en/sqlite.installation.php), but this is not a requirement for the plugin to work.

1. Copy the flexicache plugin directory into your WordPress "plugins" directory (the new directory should be called "wp-content/plugins/flexicache")
2. If you intend to run the plugin in Standalone mode, check that mod_rewrite is enabled in Apache.
3. If you intend to use the Memcache storage engine, you will need a Memcached server and PHP's Memcache extension.
4. In your WordPress admin area, visit the "Plugins" page and activate FlexiCache. FlexiCache will not start caching until it is also enabled in its own config.
5. Ensure that your web server has permission to write to the "_data" directory inside the plugin directory.
6. Click on the "Configuration & Status" link (or go to Settings | FlexiCache) and read the Documentation section.
7. Configure and enable FlexiCache.