{"id":1206,"date":"2018-10-15T18:34:48","date_gmt":"2018-10-15T18:34:48","guid":{"rendered":"https:\/\/www.s-sols.com\/?p=1206"},"modified":"2021-11-05T09:05:15","modified_gmt":"2021-11-05T09:05:15","slug":"enable-php-code-cache","status":"publish","type":"post","link":"https:\/\/www.s-sols.com\/enable-php-code-cache","title":{"rendered":"Increase site\u2019s speed by enable PHP code caching"},"content":{"rendered":"

\n PHP cache incredible increases the speed of a site<\/strong>. For instance, if request preparation takes 1.2 seconds, after cache enabling it will take 0.6 seconds (increase by about 50%). Particularly, it influences on WordPress<\/strong> significantly as well because it contains a lot of PHP code.\n<\/p>\n

\n On some sites based on e.g. WAMP (Apache, MySQL and PHP bundle for Windows) PHP code cache is turned off by default so it\u2019s better<\/strong> for us to check the settings<\/strong>.\n<\/p>\n

\n The most popular way to do that is to use OpCache \u2013 a special PHP module that does code caching. In PHP 5.5 and above this module already integrated into.\n<\/p>\n

\n How it works
\n<\/h2>\n

\n OpCache provides faster PHP execution through compiled code caching and optimization. It improves PHP performance by storing precompiled script bytecode in the shared memory. Every time a PHP script is requested, the PHP script will be parsed and compiled into opcode, which then is executed in the engine. When an opcode cache is introduced, after a PHP script is interpreted and turned into opcode (compiled), it\u2019s saved in shared memory, and subsequent requests will skip the parsing and compilation phases and leverage the opcode stored in memory, reducing the script\u2019s execution time.\n<\/p>\n

\n \"script-cache-scheme\"\n<\/p>\n

\n Configure
\n<\/h2>\n

\n Configuration mainly is done by editing a special file named php.ini<\/strong>.\n<\/p>\n

<\/a>Locate configuration file
\n<\/h3>\n

\n The location is depend on a system and can be like \/etc\/php5\/apache2\/php.ini or \/etc\/php5\/fpm\/php.ini, \/usr\/local\/lib\/php.ini on Unix-similar systems and C:\\wamp\\bin\\php\\php5.5.12\\php.ini on Windows.\n<\/p>\n

\n In WAMP there is a special menu item that opens it.\n<\/p>\n

\n \"wamp-php-ini\"\n<\/p>\n

\n Also, a file\u2019s location can always be discovered from PHP info. Just create phpinfo.php file with content <?php phpinfo(); ?><\/code>, copy it to the web server\u2019s root directory and run it by http:\/\/localhost\/phpinfo.php. The location is in the Configuration File (php.ini) Path<\/strong> section of the first block (look at the picture below).\n<\/p>\n

\n \"phpinfo-php-ini-location\"\n<\/p>\n

\n Set settings
\n<\/h3>\n

\n All settings are located in [opcache] section of php.ini<\/strong>.\n<\/p>\n

\n Ensure that the main settings exist there:\n<\/p>\n

[opcache]
zend_extension=<correct_path_to_php_opcache_module>
opcache.enable=1<\/code>\n<\/p>\n

\n Other additional settings can be left untouched with default values. But sometimes it\u2019s required to tune them. So here is a short description of each important one with recommended values.\n<\/p>\n