How to use memcached function in PHP

Memcached is a high-performance distributed memory object caching system that can be used to cache data, website pages, etc. Using memcached in PHP can greatly improve the performance and response speed of your website. This article will explain how to use the memcached function in PHP, including installing and configuring the memcached service, PHP extensions, usage examples, etc.

1. Installation and configuration of memcached service

In Linux system, you can use the following command to install memcached:

sudo apt-get install memcached

After the installation is completed, you can use the following command to view memcached Whether it is running normally:

sudo service memcached status

If it shows that memcached is currently running, it means that memcached is installed and set up successfully.

2. PHP extension

In order to use the memcached function in PHP, you also need to install the memcached extension. You can use the following command to install:

sudo apt-get install php-memcached

After the installation is complete, you need to add the following configuration in php.ini:

extension=memcached.so

After saving, restart the apache or php-fpm service to make the configuration effective .

3. Usage Example

The following is a simple PHP example to demonstrate how to use the memcached function in PHP:

<?php
// 连接memcached服务器
$memcached = new Memcached();
$memcached->addServer('localhost', 11211);

// 设置缓存值，有效期为5分钟
$memcached->set('name', 'Tom', 300);

// 获取缓存值
$name = $memcached->get('name');

echo $name;
?>

In the above code, first pass new Memcached( ) to connect to the memcached server. Then use the addServer() method to add the memcached server address and port number. Then use the set() method to set the cache value and specify the cache validity period as 5 minutes. Finally, use the get() method to obtain the cached value and output the result to the page.

4. Commonly used methods

memcached provides many commonly used methods. Here are some of the more commonly used methods:

1. addServer($host, $port) : Add a memcached server.
2. set($key, $value, $expiration): Set a key-value pair and specify the expiration time.
3. get($key): Get the value of the specified key.
4. delete($key): Delete the value of the specified key.
5. flush(): Clear all cache items.
6. increment($key, $offset): Increase the value of the specified key by the specified value.
7. decrement($key, $offset): Decrease the value of the specified key by the specified value.

5. Summary

memcached is a high-performance distributed memory object caching system. You can use the memcached function in PHP to cache data and improve the performance and response speed of the website. Before using memcached, you need to install and configure the memcached service and PHP extension. Memcached in PHP provides many commonly used methods, and you can choose the appropriate method according to different needs.

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