Yii framework middleware: Use caching and CDN to speed up the loading of web pages

Yii framework middleware: Use caching and CDN to accelerate the loading speed of Web pages

In Web development, the loading speed of the page directly affects the user experience and the performance of the website. In order to improve the loading speed of web pages, we can use caching and CDN (content delivery network) to speed up the transmission and display of the page. The Yii framework provides a wealth of functions to support the use of caching and CDN. This article will introduce how to accelerate the loading speed of Web pages through the Yii framework middleware.

1. Using the caching function of the Yii framework

The Yii framework provides rich caching support, including page fragment caching, data caching, HTTP caching, etc. We can use these caching mechanisms through configuration files or code.

1.1 Page fragment cache

Page fragment cache can cache the content of a certain page part, reduce the database query and rendering process, thereby improving the page loading speed. In the Yii framework, we can use widgets to implement page fragment caching.

The following is an example. Assume that we have a comment list in our page. We can use widget to cache the content of the comment list part:

use yiiwidgetsFragmentCache;

echo FragmentCache::widget([
    'id' => 'comment-list',
    'duration' => 3600,
    'dependency' => [
        'class' => 'yiicachingDbDependency',
        'sql' => 'SELECT COUNT(*) FROM comment',
    ],
    'content' => function () {
        // 渲染评论列表的代码
    },
]);

In the above code, we set an id It is the cache fragment of "comment-list", and the cache time is 3600 seconds. We also use a database dependency that automatically invalidates the cache when the number of comments changes. This way, the contents of the comments list will only be regenerated when the cache expires, thus improving page load speed.

1.2 Data caching

Data caching is to cache query results or calculation results into memory or other storage media so that the cached data can be used directly on the next request, thereby avoiding repeated queries or calculations operate.

In the Yii framework, we can use the cache component to implement data caching. The following is an example of using a cache component to cache query results:

// 获取缓存组件
$cache = Yii::$app->cache;

// 查看缓存是否存在
$key = 'user_list';
$data = $cache->get($key);
if ($data === false) {
    // 如果缓存不存在，则查询数据库并缓存查询结果
    $data = User::find()->all();
    $cache->set($key, $data, 3600);
}

// 使用缓存数据
foreach ($data as $user) {
    // 显示用户信息
}

In the above code, we use the Yii framework's built-in cache component Yii::$app->cache for caching operations. We first try to get the data from the cache. If the acquisition fails, we perform a database query and cache the query results. In this way, on the next request, we can directly use the cached data, avoiding repeated database queries, thereby improving the page loading speed.

2. Use CDN to accelerate the loading speed of Web pages

When transmitting Web pages, we can use CDN to accelerate the loading speed of the page. CDN (Content Delivery Network) caches static resources of Web pages (such as pictures, style sheets, scripts, etc.) to servers closer to users, thereby reducing transmission distance and improving page loading speed.

In the Yii framework, we can use CDN to accelerate requests for static resources. The following is an example of using a CDN to load images:

use yiihelpersHtml;

// 使用CDN来加载图像
echo Html::img('http://cdn.example.com/images/logo.png');

In the above code, we use the Html helper class provided by the Yii framework to generate image tags and specify the address of the CDN. In this way, when the page loads, the images will be loaded from the CDN server, thereby improving the page loading speed.

In addition to loading static resources, we can also speed up the storage of static resources through CDN. In the Yii framework, we can use cloud storage services (such as Qiniu Cloud, Alibaba Cloud, etc.) to store and distribute static resources. The following is an example of using Qiniu Cloud Storage to store and distribute images:

use yiihelpersHtml;

// 使用七牛云存储来加载图像
echo Html::img('http://cdn.example.com/images/logo.png', ['style' => 'width: 200px; height: 100px;']);

In the above code, we also use the Html helper class provided by the Yii framework to generate image tags, and specify Qiniu Cloud storage address and image style. In this way, when the page is loaded, the image will be loaded from the Qiniu cloud storage server, thereby further improving the page loading speed.

In summary, by using the Yii framework middleware to implement caching and CDN acceleration mechanisms, we can greatly increase the loading speed of Web pages, improve user experience and website performance. I hope this article can help you accelerate page speed when developing web applications using the Yii framework.

Reference materials:

• Yii documentation: https://www.yiiframework.com/doc/guide/2.0/zh-cn/caching-overview
• CDN Wiki: https://en.wikipedia.org/wiki/Content_delivery_network

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