PHP website performance tuning: How to avoid repeated loading of resources to improve access speed?

PHP website performance tuning: How to avoid repeated loading of resources to improve access speed?

When developing a website, user experience is often crucial. And website performance is one of the key factors. A responsive website can improve user satisfaction and may bring in more traffic and increase the website's conversion rate. In the process of performance tuning of PHP websites, avoiding repeated loading of resources is an effective method, which can greatly improve the access speed of the website.

Repeated loading of resources refers to loading the same resources multiple times on the same page, such as CSS files, JavaScript files, images, etc. In this case, an HTTP request needs to be sent for each load, which wastes bandwidth and response time. Here are several ways to avoid loading resources repeatedly.

1. Merge resource files

Merge resource files is the most intuitive way to avoid repeated loading. During website development, we usually introduce CSS and JavaScript files into different pages dispersedly. When users visit multiple pages, loading the same resource files repeatedly can cause performance issues.

In order to avoid this situation, you can merge resource files of the same type and introduce the merged files into the page. For example, we can merge all CSS files into one file, named "styles.css", and only need to introduce the file once into the page.

Similarly, you can merge all JavaScript files into one file and name it "scripts.js", which also only needs to be introduced once.

In this way, you can avoid repeated loading of resources, thereby improving the access speed of the website.

Sample code:

Introduce the merged CSS file into the HTML code:

<link rel="stylesheet" href="styles.css">

Introduce the merged JavaScript file into the HTML code:

<script src="scripts.js"></script>

二, Use caching mechanism

Another way to avoid repeated loading of resources is to use caching mechanism. When a client requests a page, the server can send the required resource files to the client and cache these files in the client's browser. When the client requests the same page again, the browser can obtain these resource files directly from the cache without having to initiate an HTTP request again.

In PHP, the caching mechanism can be enabled by setting HTTP response headers. For example, you can use the following code to control the cache time of resource files:

header("Cache-Control: max-age=3600"); // 缓存时间为3600秒

By setting the cache time appropriately, you can improve the access speed of the website and reduce unnecessary HTTP requests.

3. Use CDN (Content Distribution Network)

Content Distribution Network (CDN) is a distributed deployment server that caches static files to multiple geographical locations to provide faster response Speed ​​technology. CDN can provide high availability and high performance services, thereby accelerating website access speed.

In PHP development, CDN can be used to speed up the access speed of static resource files. Upload static files such as CSS and JavaScript to the CDN service provider's server, and introduce resource files on the CDN into the website. In this way, when users access the website, they can obtain these files from CDN nodes closer to themselves, thus improving access speed.

Sample code:

Introduce resource files on CDN into HTML code:

<link rel="stylesheet" href="https://cdn.example.com/styles.css">

<script src="https://cdn.example.com/scripts.js"></script>

Summary:

It is an effective method to avoid repeated loading of resources. It can improve the access speed of PHP website. During the development process, merging resource files, using caching mechanisms, and using CDN are all common optimization methods. By rationally applying these methods, the performance of the website can be greatly improved and the user experience improved.

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