Key techniques for implementing high-performance PHP websites using Memcache

Key tips for using Memcache to implement high-performance PHP websites

With the rapid development of the Internet, the number of website visits is increasing, and how to improve the performance of the website has always been the focus of developers. As a high-performance caching technology, Memcache can not only effectively reduce the pressure on the database, but also speed up the response speed of web pages. This article will introduce the key skills of how to use Memcache to implement high-performance PHP websites, and demonstrate the specific implementation through code examples.

1. Install and configure Memcache
First, we need to install the Memcache extension on the server. Taking Ubuntu as an example, you can install it with the following command:

sudo apt-get install memcached
sudo apt-get install php-memcache

After the installation is complete, you need to configure the parameters of Memcache. Enter the following command in the terminal to open the configuration file:

sudo nano /etc/memcached.conf

Modify the parameter "-l 127.0.0.1" to "-l 0.0.0.0" and change the listening address to any IP address to allow external access. Save and exit.

Restart the Memcache service:

sudo service memcached restart

2. Connect and operate Memcache
Connect to the Memcache server in the PHP code and perform related operations. The following is a sample code:

<?php
$memcache = new Memcache;
$memcache->connect('localhost', 11211);

// 存储数据到缓存中
$memcache->set('key', 'value', MEMCACHE_COMPRESSED, 3600);

// 从缓存中获取数据
$data = $memcache->get('key');

// 删除缓存中的数据
$memcache->delete('key');

// 清空所有缓存
$memcache->flush();

// 关闭连接
$memcache->close();
?>

In the above code, we first connect to the Memcache server through the connect method, store data into the cache in the set method, and Set the expiration time to 3600 seconds. Then, get the data from the cache in the get method. The delete method is used to delete the data in the cache, and the flush method can clear all caches. Finally, close the connection through the close method.

3. Common operations and techniques

1. Set expiration time: When using the set method to store data, you can automatically clear the cache by setting the expiration time to ensure Real-time nature of data.
2. Handling the situation when the cache fails: When the Memcache cache fails, you can add logic to regenerate the cache in the code to ensure the continuity and consistency of the data.
3. Sharded storage of data: Sharding a large amount of data can improve read performance. For example, users' personal information is stored in shards to reduce the amount of data read each time.
4. Use queues and caches together: put certain short-term but frequent operations into the cache to avoid repeated access to the database, and use queues to handle long-term operations to ensure the response speed of web pages.
5. Set the cached value size appropriately: If the cached value is too large, it will affect performance. The cache value size needs to be set appropriately based on the actual situation.

4. Summary
The key techniques for using Memcache to implement PHP high-performance websites mainly include installing and configuring Memcache, connecting and operating Memcache, and some common operations and techniques. By rationally utilizing Memcache caching technology, the performance of the website can be effectively improved, the pressure on the database can be reduced, and the response speed of the web page can be accelerated. However, it should be noted that the cache expiration time needs to be set according to actual needs, and the situation when the cache expires needs to be handled well to ensure data continuity and consistency. At the same time, queues and caching can also be combined to improve website performance. I hope this article will help you understand and apply Memcache caching technology.

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