How to use PHP's APC extension?

PHP is a widely used server-side scripting language. The language is easy to learn, rapid development, and can support a variety of databases, which makes PHP an excellent Web programming language. At the same time, PHP also has many extensions, among which the APC extension can significantly improve the performance of PHP. This article will introduce how to use the APC extension to optimize the operating efficiency of PHP.

1. What is APC extension

APC (Alternative PHP Cache) is a caching tool for storing PHP scripts. It supports caching PHP code in memory, thereby reducing the work of the PHP interpreter. amount to improve the execution speed of PHP programs. APC cache can be installed as a module or as a PHP extension. Extension installation can be more convenient, so this article will introduce how to use extensions to install.

2. Installation of APC extension

1. View the PHP configuration information of the server

In the terminal or command prompt, you can run the following command to view PHP Configuration information:

php -i

This command will output PHP detailed information, including PHP version, extension module configuration information, etc.

2. Install APC extension

Installing APC extension can be installed using the PECL command, execute the following command:

pecl install apc

If PECL is not installed on your server , you can install it using the following command:

yum install php-pecl-apc

This command will install using the yum package manager. If you are using another distribution such as Debian or Ubuntu, use the apt-get command to install it.

3. Enable APC extension

After installing the APC extension, you need to enable it in the php.ini configuration file. You can use the following command to edit the configuration file:

sudo nano /etc/php.ini

After opening the php.ini file, add the following content in the "Dynamic Extensions" section:

extension=apc.so

In addition, you can also add the following content in php.ini File to set the APC cache size and other options. You can add the following line to set the cache size:

apc.shm_size=128M

This line sets the size of the APC cache to 128MB. Can be adjusted based on your server configuration and needs.

4. Restart the Web server

After the configuration file is modified, you need to restart the Web server for the changes to take effect. You can use the following command to restart the Apache server:

sudo service httpd restart

If you are using Nginx, please use the following command to restart:

sudo service nginx restart

3. Testing and Optimization

After the installation is completed , we can use some command line tools for testing and optimization.

1. View APC cache status

You can use the apc.php script to view the APC cache status on the web page, which is located in the installation directory of the APC extension. Copy the apc.php script to the root directory of the web service, for example, copy it to /var/www/html/apc.php. Enter your website domain name followed by apc.php in the browser (for example, http:// example.com/apc.php), you can view the status and related information of the APC cache.

2. Optimize the APC cache

You can use the following command to optimize the APC cache:

php -r 'apc_clear_cache();'

This command will clear the APC cache and help improve the PHP program operating efficiency. This command can be automatically executed periodically using the crontab command.

4. Conclusion

APC extension is an excellent tool that can effectively improve the operating efficiency of PHP programs. We can install using the PECL command, or install from package managers such as Yum and APT. After the installation is complete, you also need to enable it in the php.ini configuration file. Finally, there are some commands that allow for testing and optimization. I hope this article can help you when using APC extensions to optimize PHP programs.

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