Data caching technology and usage scenarios of PHP and CGI

Data caching technology and usage scenarios of PHP and CGI

Foreword:
In Web development, data caching is a key technology used to improve application performance and reduce server load. This article will introduce the data caching technology of PHP and CGI and its usage scenarios, and give code examples.

1. PHP data caching technology
In PHP, common data caching technologies are:

1. File caching
2. Memcached caching
3. Redis cache

4. File cache
   File cache is a simple and easy-to-implement data caching method. This can be achieved using PHP's file reading and writing functions.
   Code example:

   // 写入缓存 $data = "缓存的数据"; $file = "cache.txt"; file_put_contents($file, $data); // 读取缓存 if (file_exists($file)) { $data = file_get_contents($file); // 处理缓存数据 } else { // 生成新的数据 }

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5. Memcached cache
   Memcached is a commonly used memory caching system that can be used by starting the Memcached service on the server. PHP provides Memcached extension for operating Memcached cache.
   Code example:

   // 连接Memcached服务器 $memcached = new Memcached(); $memcached->addServer('localhost', 11211); // 写入缓存 $data = "缓存的数据"; $key = "my_key"; $memcached->set($key, $data, 3600); // 读取缓存 $data = $memcached->get($key); if ($data) { // 处理缓存数据 } else { // 生成新的数据 }

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6. Redis Cache
   Redis is a high-performance key-value storage system that can be used as a cache server. PHP provides a Redis extension for operating Redis cache.
   Code sample:

   // 连接Redis服务器 $redis = new Redis(); $redis->connect('127.0.0.1', 6379); // 写入缓存 $data = "缓存的数据"; $key = "my_key"; $redis->set($key, $data, 3600); // 读取缓存 $data = $redis->get($key); if ($data) { // 处理缓存数据 } else { // 生成新的数据 }

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2. CGI data caching technology
CGI (Common Gateway Interface) is a commonly used server-side interface for processing Web requests. In CGI programs, data caching technology can also be used to improve performance.
Common CGI data caching technologies are:

1. File cache
2. Memcached cache
3. Redis cache

Usage methods and The example is similar to that in PHP, except that the corresponding language library needs to be called in the CGI program to implement it.

3. Data caching usage scenarios
Data caching can be used to optimize various types of web applications. The following are some common usage scenarios:

1. Database query result caching : Cache frequently queried database results to reduce the load on the database.
2. Staticization of dynamic pages: Cache the output results of dynamic pages into static files to reduce the number of calculations and queries.
3. API response result caching: For frequently called API interfaces, the response results of the interface can be cached to reduce the number of requests to the API.
4. Caching of frequent calculation results: For results that require frequent calculations, the calculation results can be cached to improve calculation speed.

Conclusion:
Data caching is an important and practical technology that can effectively improve the performance and concurrent processing capabilities of web applications. By using technologies such as PHP's file cache, Memcached cache, and Redis cache, data caching can be flexibly applied in different scenarios, thereby improving the performance of the entire system.

Reference link:

• PHP official documentation: https://www.php.net/
• Memcached official website: https://memcached.org/
• Redis official website: https://redis.io/

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