PHP 7.0 (and 5.6) on Ubuntu
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Explain htaccess rules?
http://stackoverflow.com/questions/18236838/explain-htaccess-rules
Speed up your PHP application with Zend OpCache
http://fideloper.com/install-zend-opcache Also read https://www.digitalocean.com/community/questions/how-to-install-alternative-php-cache-apc-on-ubuntu-14-04