How to improve the access speed of PHP website by compressing CSS and JavaScript files?

How to improve the access speed of PHP website by compressing CSS and JavaScript files?

With the rapid development of the Internet, website access speed has become an important indicator of user experience. As a commonly used server-side scripting language, PHP has also become crucial for website performance optimization. This article will introduce how to improve the access speed of PHP websites by compressing CSS and JavaScript files to improve user experience.

1. Why compress CSS and JavaScript files?

During the website development process, we usually use various CSS and JavaScript libraries to achieve different functional requirements. However, the size of these files is often very large, which affects the loading speed of web pages. By compressing these files, the file size can be reduced, thereby increasing the loading speed of the website.

2. Compression of CSS files

1. Delete comments: CSS files usually contain some comments. These comments have no practical effect on the rendering of web pages, so they can be deleted. Reduce file size.

Code example:

/* 注释内容 */
.selector {
    /* 属性值 */
}

Compressed code:

.selector {
    /* 属性值 */
}

2. Removing spaces and line breaks: parsing of spaces and line breaks in CSS files for styles It has no effect and can be deleted to reduce file size.

Code example:

.selector1 {
    /* 属性值1 */
}

.selector2 {
    /* 属性值2 */
}

Compressed code:

.selector1 {/* 属性值1 */}
.selector2 {/* 属性值2 */}

3. Compression of JavaScript files

1. Delete comments: and Similar to CSS files, comments in JavaScript files have no practical effect on the execution of the code and can be deleted to reduce the file size.

Code example:

// 注释内容
var x = 10;

Compressed code:

var x = 10;

2. Remove spaces and newlines: Similarly, spaces and newlines in JavaScript files are important for code has no impact on the execution and can be deleted to reduce the file size.

Code example:

function foo() {

    // 函数体
    var x = 10;
}

Compressed code:

function foo(){var x=10;}

4. Use compression tools

Although it is possible to manually compress CSS and JavaScript files , but for large websites, the workload and the possibility of errors are relatively large. Therefore, we can use some compression tools to automate the process.

1. CSS compression tools: such as CSS Nano, UglifyCSS, etc.

Example commands for compression using CSS Nano:

$ cssnano input.css output.css

2. JavaScript compression tools: such as UglifyJS, Terser, etc.

Example commands for compression using UglifyJS:

$ uglifyjs input.js -o output.js

By using these compression tools, we can simplify our workflow and improve efficiency.

5. Add the compressed file link

After the compression is completed, we need to modify the PHP code and replace the original CSS and JavaScript file links with the compressed file links.

Code example:

<!-- 压缩前 -->
<link rel="stylesheet" href="style.css">

<!-- 压缩后 -->
<link rel="stylesheet" href="compressed/style.min.css">

<!-- 压缩前 -->
<script src="script.js"></script>

<!-- 压缩后 -->
<script src="compressed/script.min.js"></script>

By replacing links, the file size is reduced while maintaining the same website functions, thereby improving the loading speed of the website.

6. Other optimization suggestions

In addition to compressing CSS and JavaScript files, you can also further improve the access speed of the PHP website through the following methods:

1. Merge files: Merge multiple CSS or JavaScript files into one file to reduce the number of requests and speed up the loading of web pages.
2. Use CDN acceleration: Deploy the static resources of the website (such as images, CSS, JavaScript, etc.) to the CDN, allowing users to obtain resources from the server closest to them, reducing network delays and improving user access speed.
3. Use caching: Set the caching strategy appropriately and cache some static resources to the user's local browser to reduce server pressure and speed up user access.

To sum up, by compressing CSS and JavaScript files, the file size can be reduced and the access speed of the PHP website can be improved. At the same time, combined with other optimization strategies, the user experience can be further improved. Optimizing website access speed is of great significance to improving user satisfaction and website competitiveness.

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