How to optimize the access speed of PHP website through Gzip compression?

How to optimize the access speed of PHP website through Gzip compression?

With the development of the Internet, people have higher and higher requirements for web pages, and access speed has become one of the important indicators for judging the quality of a website. Gzip compression technology is an important method to optimize website access speed. This article will introduce how to optimize the access speed of PHP website through Gzip compression.

1. What is Gzip compression technology?

Gzip compression technology is a technology that improves website access speed by reducing the size of HTML, CSS, JavaScript and other files. Through Gzip compression, large files can be compressed into smaller files, thereby reducing the amount of data transmitted, improving the loading speed of the website, and speeding up the user experience of accessing the website.

2. Turn on Gzip compression

In PHP, to turn on Gzip compression, you can use the following code:

<?php
ob_start("ob_gzhandler");
?>

The function of this code is to The output content is compressed by Gzip and sent to the browser. The ob_start() function is used to open the output buffer and specify the compression function as ob_gzhandler().

3. Detect whether the browser supports Gzip

In PHP, we can detect whether the browser supports Gzip compression through the following code:

<?php
function isGzipSupported() {
    if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== false) {
        return true;
    } else {
        return false;
    }
}

if (isGzipSupported()) {
    ob_start("ob_gzhandler");
} else {
    ob_start();
}
?>

This paragraph The code first defines a function isGzipSupported(), which is used to detect whether the browser supports Gzip compression. If the browser supports Gzip compression, enable compression; otherwise, no processing is performed.

4. Configure the server to support Gzip compression

In addition to turning on Gzip compression in PHP, you can also configure the server to support Gzip compression. For the Apache server, this can be achieved by modifying the .htaccess file.

Add the following code in the .htaccess file:

<IfModule mod_deflate.c>
    #开启Gzip压缩
    SetOutputFilter DEFLATE
    AddOutputFilterByType DEFLATE text/html text/css text/javascript application/javascript application/json
    DeflateCompressionLevel 9
    #排除不需要压缩的文件
    SetEnvIfNoCase Request_URI .(?:gif|jpe?g|png)$ no-gzip
</IfModule>

The function of this code is to enable Gzip compression and specify the file type that needs to be compressed. At the same time, files that do not need to be compressed, such as picture files, can be excluded through the SetEnvIfNoCase command.

5. How to test whether Gzip compression is turned on

You can test whether Gzip is turned on through online tools, such as https://tools.pingdom.com/ and other websites compression. In the test results, you can see whether Gzip compression is enabled, as well as information such as the compression rate.

Summary:

Through Gzip compression technology, the size of HTML, CSS, JavaScript and other files can be greatly reduced, thereby improving the access speed of the website. In PHP, this can be achieved by turning on Gzip compression and detecting that the browser supports Gzip compression. In addition, Gzip compression can be turned on through server configuration. Turning on Gzip compression can not only improve user experience, but also save bandwidth costs. Therefore, when developing and optimizing a website, Gzip compression technology should be fully utilized to improve the website access speed.

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