PHP 301 Redirect

301 redirect is used to redirect a page permanently to a particular URL or page. Mostly used to improve SEO.

301 is the HTTP status code for a type of redirect.

In PHP, we can pass 301 as a parameter to PHP function header() to redirect a page permanently.

This tutorial demonstrates how to redirect a page permanently using PHP and 301.

Use 301 and PHP header() Function to Redirect to a Page or URL Permanently

We can use PHP header() function and 301 in a few ways to permanently redirect to a given URL.

<?php
//Setting the HTTP status code first, then redirect.
header("HTTP/1.1 301 Moved Permanently"); 
header("Location: https://www.delftstack.com/"); 
exit();
?>

Here is a simple way:

<?php
//We can also pass the HTTP status code 301 as a parameter in PHP `header()`.
header("Location: https://www.delftstack.com/",TRUE,301);
?>

PHP also has a function to set HTTP status code http_response_code(); we can use this function and then redirect, which will also be a 301 redirect. See example:

<?php
http_response_code(301);
header('Location: https://www.delftstack.com/'); 
exit;
?>

All three codes above have the same output, and it will permanently redirect the domain to our site https://www.delftstack.com/.

First, we run index.php with the above code, and it redirects to our site https://www.delftstack.com/, then we comment the code in index.php and run it again.

We will see the index.php URL is permanently set to https://www.delftstack.com/.

Output: