PHP-FPM performance improvement practice: application and optimization of caching technology

PHP-FPM performance improvement practice: application and optimization of caching technology

Introduction:
With the continuous development of Internet technology, PHP is widely used as a programming language that plays an important role in website and application development. However, since PHP is a scripting language, its performance is relatively low and can easily cause excessive pressure on the server. In order to improve the performance of PHP-FPM, we can use caching technology to optimize code execution efficiency. This article will introduce the application and optimization methods of caching technology and provide specific code examples.

1. What is caching technology
Cache technology is a technology that saves data or calculation results in temporary storage media. Through caching technology, the number of accesses to the database and disk can be greatly reduced, thereby improving the performance of PHP-FPM.

2. Application and optimization methods of caching technology

1. Page caching
   Page caching is the most common caching technology, which saves the calculated page content to the cache , you can avoid repeated database queries and calculations, and improve the page loading speed.
   The specific implementation can use some open source caching libraries, such as Memcached or Redis, to save the generated HTML page content in memory and read it directly from the cache the next time it is requested.
2. Data caching
   Applying data caching technology to data that requires frequent access can greatly improve the efficiency of database queries.
   A common method is to use Redis as a data cache and store the queried data in Redis. When making the next request, first check whether there is cached data in Redis. If so, return it directly to avoid database corruption. Query operations.

Sample code:

// 使用Redis进行数据缓存
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

// 查询数据库
$data = $db->query("SELECT * FROM users WHERE id = 1")->fetch_assoc();

// 将查询结果存入缓存
$redis->set('user:1', json_encode($data));

// 下次请求时，先检查缓存是否存在
if ($redis->exists('user:1')) {
    $data = json_decode($redis->get('user:1'), true);
} else {
    // 如果缓存不存在，则查询数据库
    $data = $db->query("SELECT * FROM users WHERE id = 1")->fetch_assoc();
    // 将查询结果存入缓存
    $redis->set('user:1', json_encode($data));
}

// 输出查询结果
print_r($data);

3. File cache
   In some cases, the calculation results can be saved to a file, and the file content can be read directly on the next request. Avoid double counting process.
   In fact, file caching technology is also a relatively simple but effective caching method, suitable for some data that does not change frequently.

Sample code:

// 判断缓存文件是否存在
if (file_exists('cache.html') && (time() - filemtime('cache.html')) < 60) {
    // 如果缓存文件存在且未过期，则直接读取文件内容并输出
    echo file_get_contents('cache.html');
} else {
    // 如果缓存文件不存在或已过期，则生成新的缓存文件
    $data = getData(); // 获取需要缓存的数据
    $content = generateHtml($data); // 根据数据生成HTML内容
    file_put_contents('cache.html', $content); // 将HTML内容写入缓存文件
    echo $content; // 输出HTML内容
}

Through the above code examples, we can see that in page caching, data caching and file caching, by avoiding repeated calculations and query operations, The performance of PHP-FPM can be greatly improved.

Conclusion:
Caching technology is one of the important means to improve the performance of PHP-FPM. Through reasonable application of caching technology, it can effectively reduce the load pressure of the server and improve the response speed of websites and applications. In practical applications, we can choose a suitable cache library based on actual needs and adopt appropriate caching strategies and optimization methods to achieve better performance improvement.

References:

1. Tung Nguyen. (2019) PHP Performance Optimization: A Practical Guide to Caching Technology.
2. Zhang San. (2020) Research on the application and optimization methods of PHP-FPM caching technology.
3. Li Si. (2018) Practice and optimization of PHP caching technology in e-commerce websites.

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