How to optimize website performance using PHP

By optimizing database queries, compressing pages and resources, enabling page caching, optimizing PHP code and loading resources, you can effectively improve PHP website performance. For example, one e-commerce website used page caching, database index optimization, and Gzip compression to reduce site load time by 60% and increase conversion rates by 25%.

How to use PHP to optimize website performance

Optimizing PHP website performance is crucial because it can improve user experience and improve search Engine rankings and lower website costs. This article will explore effective optimization strategies for PHP websites and provide practical examples.

1. Enable page caching

• Use a caching solution such as Memcached, Redis or Varnish to store application-generated pages to reduce database queries and PHP processing.

  // 使用 Varnish 作为反向代理服务器
  $varnish_server = '127.0.0.1';
  $varnish_port = 80;
  $varnish = new Varnish($varnish_server, $varnish_port);
  $varnish->purge('/*'); // 清除所有缓存页面

2. Optimize database queries

• Use indexes to optimize tables.
• Limit query results.

• Use JOIN instead of multiple SELECT.

  // 使用索引优化表
  $sql = "CREATE INDEX idx_name ON users(name)";

3. Optimize PHP code

• Reduce unnecessary loops and branches.
• Use PHP built-in functions instead of custom functions.

• Optimize string processing.

  // 使用 PHP 内置函数代替自定义函数
  $search_term = 'PHP Optimization';
  $escaped_term = addslashes($search_term); // 转义搜索术语

4. Compress pages and resources

• Use Gzip or Brotli to compress pages and resources to reduce file size and transfer time.

  // 启用 Gzip 压缩
  ob_start('ob_gzhandler');

5. Load resources

• Optimize images and use CSS sprites to merge multiple small images.

• Load JavaScript and CSS files from CDN.

  // 从 CDN 加载 jQuery 库
  echo '<script src="//ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>';

Practical case:

An e-commerce website implemented page caching, database index optimization and Gzip compression. As a result, website load times were reduced by 60% and conversion rates increased by 25%.

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