php怎么做cdn加速器

// 原始资源URL
$originalUrl = 'https://example.com/static/image.jpg';

// CDN URL
$cdnUrl = 'https://cdn.example.com/static/image.jpg';

// 替换资源URL
$imageUrl = str_replace($originalUrl, $cdnUrl, $imageUrl);

http {
    upstream cdn_nodes {
        server cdn1.example.com;
        server cdn2.example.com;
        server cdn3.example.com;
    }

    server {
        listen 80;
        server_name cdn.example.com;

        location /static/ {
            proxy_pass http://cdn_nodes;
            proxy_cache_valid 200 302 10m;
            proxy_cache_valid 404 1m;
        }
    }
}

$imageUrl = 'https://example.com/static/image.jpg?v=' . filemtime('path/to/image.jpg');

// 连接Redis
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

// 获取缓存内容
$content = $redis->get('dynamic_content_key');

if (!$content) {
    // 生成动态内容
    $content = generateDynamicContent();

    // 缓存动态内容
    $redis->setex('dynamic_content_key', 3600, $content);
}