How Memcache caching technology builds the caching architecture in PHP

With the advent of the Internet era, the number of visits to Web applications is increasing, and performance has increasingly become one of the priority considerations for users. Caching technology emerged as the times require. Memcache, as a high-performance, distributed memory object caching system, is widely used in Web development.

Building a Memcache caching architecture in PHP can greatly improve the performance and response speed of web applications. Below we will divide it into the following aspects to explain how Memcache caching technology is built in PHP.

1. Install and configure Memcache server
Memcache server can run in various operating systems such as Linux and Windows. To install the Memcache server in Linux, you need to use the command sudo apt-get install memcached to install it. In Windows environment, users need to download and install it from the official website. After the installation is complete, you can start the Memcache server through the command memcached -d -m 1024 -p 11211 -u root. The -d option indicates to run the Memcache server as a daemon process, the -m option indicates the memory space allocated to the Memcache server, the -p option indicates the port number that the Memcache server listens to, and the -u option indicates the running user of the Memcache server.

2. Using Memcache extension in PHP
Using Memcache extension in PHP can easily achieve communication with the Memcache server. This extension needs to be loaded in PHP. If you are developing under the Linux operating system, you can install the Memcache extension by executing the command sudo apt-get install php-memcached. Under the Windows operating system, users need to download the corresponding dll file from the official website, and then add extension=php_memcache.dll to the php.ini file. With one line, you can enable PHP to support the Memcache extension.

3. Use Memcache to cache data
Using Memcache to cache data is very simple. The process of caching data can be divided into the following three steps:

1. Create Memcache object

Use the following code to create a Memcache object in PHP:

$memcache = new Memcache;

2. Connect Memcache server

$memcache->connect('127.0.0.1', 11211);

3. Cache data

$memcache->set('key', 'value', $expire_time);

Among them, key represents the key of cached data, value represents the value of the cached data, expire_time represents the expiration time of the data. If the expiration time is not specified, the default expiration time is 0, which means the data is permanently valid.

4. Memcache caching application
Memcache caching application needs to be carried out in actual projects. We can cache commonly used database query results, user-uploaded files and other objects that require frequent reading and writing. The following examples illustrate how to apply Memcache caching in actual projects.

1. Cache database query results

function get_data_from_db($key){
    $memcache = new Memcache;
    $memcache->connect('127.0.0.1', 11211);
    $data = $memcache->get($key);
    if($data === false){
        //从数据库中读取查询结果
        //...
        //将查询结果写入Memcache缓存中
        $memcache->set($key, $data, $expire_time);
    }
    return $data;
}

2. Cache user-uploaded files

function get_file_content($filename){
    $memcache = new Memcache;
    $memcache->connect('127.0.0.1', 11211);
    $content = $memcache->get($filename);
    if($content === false){
        //读取文件内容
        //...
        //将文件内容写入Memcache缓存中
        $memcache->set($filename, $content, $expire_time);
    }
    return $content;
}

Conclusion
Memcache caching technology is to improve An important way to improve the performance and responsiveness of web applications, and it is also relatively simple to build using Memcache caching technology in PHP. You need to install and configure the Memcache server in the system, import the Memcache extension in PHP, and then use the Memcache object to implement data caching. In actual projects, we can cache commonly used data to improve the performance and response speed of web applications.

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