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PHP development caching skills and best practices
Introduction:
In Web development, performance is a very important indicator. In order to improve the performance of the website, caching is a very common technology. In PHP development, we can implement caching in a variety of ways. This article will introduce some common caching techniques and best practices, and provide specific code examples.
1. Page caching
The sample code is as follows:
ob_start(); // 页面生成逻辑 $content = ob_get_contents(); ob_end_clean(); echo $content;
The sample code is as follows:
// 生成缓存文件名 $cacheFile = 'cache/page_'.md5($url).'.html'; // 判断缓存是否存在 if(file_exists($cacheFile)){ // 页面输出缓存内容 echo file_get_contents($cacheFile); } else { // 执行页面生成逻辑 ob_start(); // 页面生成逻辑 $content = ob_get_contents(); ob_end_clean(); echo $content; // 写入缓存文件 file_put_contents($cacheFile, $content); }
2. Database cache
The sample code is as follows:
// 查询缓存键名 $cacheKey = 'cache/user_'.$userId; // 从缓存中获取数据 if($data = $cache->get($cacheKey)){ // 使用缓存数据 $result = $data; } else { // 执行数据库查询逻辑 $result = $db->query('SELECT * FROM user WHERE id = '.$userId); // 将数据存入缓存 $cache->set($cacheKey, $result, 3600); } echo $result;
The sample code is as follows:
// 修改数据库中的数据 $db->query('UPDATE user SET name = "John" WHERE id = '.$userId); // 清除缓存 $cache->delete('cache/user_'.$userId);
3. Dynamic content caching
In some scenarios, some content in the page will only change under specific conditions. You can change this Part of the content is cached to reduce the overhead of repeated calculations and rendering.
The sample code is as follows:
// 判断内容缓存是否存在 $cacheKey = 'cache/content_'.$contentId; if($content = $cache->get($cacheKey)){ // 使用缓存内容 echo $content; } else { // 执行内容生成逻辑 $content = generateContent($contentId); // 将内容存入缓存 $cache->set($cacheKey, $content, 3600); echo $content; }
Conclusion:
Caching is one of the common techniques to improve the performance of PHP websites. This article introduces techniques and best practices for page caching, database caching, and dynamic content caching, and provides specific code examples. Proper use of caching technology can greatly improve website performance and user experience.
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