English
English
PHP Opcache is an official PHP extension that caches the compiled PHP bytecode in memory, avoiding the need to recompile code on every request and significantly improving the execution efficiency of PHP applications. Enabling and optimizing Opcache can bring noticeable performance improvements, especially for high-concurrency websites and complex applications.
After ensuring PHP is installed on your system, you can quickly install the Opcache extension via the package manager:
<span class="fun">sudo yum install php-opcache</span>
Once installed, you need to enable Opcache in the PHP configuration file, usually located at /etc/php.ini. Open the file and add or modify the following settings:
zend_extension=opcache.so
opcache.enable=1
opcache.memory_consumption=128
opcache.interned_strings_buffer=8
opcache.max_accelerated_files=10000
opcache.revalidate_freq=2
opcache.fast_shutdown=1
These parameters can be adjusted based on your server resources and application requirements. Proper configuration of memory size and cache file limits helps to achieve the best performance.
To ensure efficient operation of Opcache, consider the following tips:
The opcache.revalidate_freq parameter controls how often Opcache checks for script updates. For frequently changing code, lower this value to ensure updates are applied promptly; for stable codebases, increasing it reduces disk IO.
Adjust the opcache.memory_consumption value according to your project's size and codebase to ensure sufficient cache space, avoiding frequent cache cleanups and invalidations.
When deploying new versions or major updates, use PHP's opcache_reset() function to manually clear the cache, ensuring the latest code is loaded correctly.
By correctly installing and configuring PHP Opcache on CentOS, combined with proper parameter tuning, you can significantly reduce PHP code compilation time and improve overall application response speed. Leveraging Opcache’s caching mechanism is a key strategy for boosting PHP performance. We hope this guide helps you build a smoother and more efficient PHP application environment.
