How to install and enable PHP Opcache on CentOS

How to install and enable PHP Opcache on CentOS

PHP Opcache is an extension module for PHP that can improve the performance of PHP applications and reduce the load on the server. Installing and enabling PHP Opcache on CentOS is very simple, the specific steps and code examples are detailed below.

Step 1: Install the PHP Opcache extension

1. Use SSH to connect to the CentOS server and log in as the root user.

2. Install the PHP Opcache extension using the following command:

   yum install php-opcache

3. After the installation is complete, reload the PHP-FPM service for the changes to take effect:

   systemctl reload php-fpm

Step 2: Configure PHP Opcache

1. Open the PHP configuration file php.ini for editing, usually located in /etc/php.ini or /etc/php/ 7.x/php.ini, where 7.x represents your PHP version. Find the following line and uncomment it:

   zend_extension=opcache.so

2. Add or modify the following configuration items to suit your needs:

   [opcache]
   opcache.enable=1
   opcache.enable_cli=1
   opcache.memory_consumption=128
   opcache.interned_strings_buffer=8
   opcache.max_accelerated_files=4000
   opcache.validate_timestamps=1
   opcache.revalidate_freq=60
   opcache.fast_shutdown=1

3. Save and exit the configuration file , and then reload the PHP-FPM service:

   systemctl reload php-fpm

Step three: Verify whether PHP Opcache is enabled

1. Create a file containing the phpinfo() function PHP file, such as info.php:

   <?php
    phpinfo();
   ?>

2. Place the info.php file into your website document directory, such as /var/www/html/.
3. Enter your domain name/info.php in the browser, check whether there is information about the Opcache module in the PHP information page, and confirm that Opcache has been successfully enabled.

At this point, you have successfully installed and enabled the PHP Opcache extension on CentOS. By optimizing the caching of PHP code, you can significantly improve your website performance and loading speed. Hope the above steps and code examples help you!

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