What is a 301 redirect? How to implement it in PHP?

During the website development process, there may be situations where the address of a certain web page needs to be modified. For example, if the website is revised, the old web addresses have become invalid, but these old web addresses have been included by search engines. If these web pages are directly deleted, the search engines will not be able to open the web pages, thus affecting the website's traffic and ranking. For this situation, you can use 301 jump to solve it. This article will introduce in detail how to implement 301 jump in PHP.

1. What is 301 jump

301 jump (HTTP 301 Moved Permanently) refers to a permanent redirection of a certain URL. After the jump, the search engine will transfer the original website equity and ranking to the new URL, and will also redirect visitors to the new URL. This ensures that access to the old URL is not affected, and at the same time allows search engines to correctly index the new URL, thereby increasing website traffic.

2. Implementing 301 jump in PHP

The way to implement 301 jump in PHP is relatively simple. It can be achieved by setting the header. The specific implementation method As follows:

header('HTTP/1.1 301 Moved Permanently');
header('Location: 新的网址');

In this code, the header function means to generate an HTTP response header. The first parameter is the HTTP response code. 301 is used here, which means permanent redirection. The second parameter is the new address of the redirect. Implementing 301 jumps in this way is very convenient and does not require the use of other libraries or frameworks.

3. Matters needing attention

1. Ensure that the new URL is valid

When making a 301 jump, you must ensure that the new URL is valid The URL is valid, otherwise the 301 redirect will not be successful. Especially before adding the URL to the header function, a verification is required to ensure that the URL can be opened normally.

2. Avoid infinite loops

When making 301 jumps, special attention needs to be paid to avoid infinite loops. If you jump back to the original URL after jumping, it will cause an infinite loop, waste resources, and may cause the website to crash. Therefore, you need to ensure that the two URLs before and after are different, and at the same time ensure that a jump is really needed.

3. Correctly set the HTTP response header

When making a 301 jump, make sure the HTTP response header is correctly set. This includes returning the correct HTTP status code as well as the new URL. If these settings are incorrect, search engines and visitors will not be able to correctly identify the jump, causing confusion.

4. Summary

Through the introduction of this article, we can understand the method of implementing 301 jump in PHP and understand the matters that need to be paid attention to. When developing a website, if you encounter a situation where you need to modify the URL, you can use a 301 jump to solve the problem and maintain the original website rights and rankings.

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