How to use PHP to implement domain name redirection function

Implementing domain name redirection function is one of the common requirements in website development, and this function can be easily realized through PHP. In this article, we will introduce how to use PHP to implement domain name redirection and give specific code examples.

Why do we need domain name redirection function?

Domain name redirection means that when the user enters a domain name, the server redirects the user's request to another specified domain name. This function is usually used for website domain name changes, associations between domain names, etc. It can ensure that users can automatically jump to the new domain name when accessing the old domain name, improving user experience and website brand consistency.

Use PHP to implement domain name redirection

To implement the domain name redirection function, you can send the HTTP redirection header through the header() function in PHP to tell the browser The server request needs to be redirected to another URL. The following is a simple PHP code example:

<?php
$redirect_url = 'http://newdomain.com'; // 新域名
header('Location: ' . $redirect_url);
exit;
?>

In the above code, the new domain name $redirect_url to be redirected is first defined, and then header('Location: ' . $redirect_url);Redirect the browser to the new domain name and end script execution by exit;.

Complete sample code

The following is a complete PHP code example that automatically redirects the user to the specified new domain name when accessing the old domain name:

<?php
$old_domain = 'http://olddomain.com'; // 旧域名
$new_domain = 'http://newdomain.com'; // 新域名

// 获取当前URL
$current_url = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

if($current_url == $old_domain) {
    header("HTTP/1.1 301 Moved Permanently");
    header("Location: $new_domain");
    exit;
}
?>

In In the above code, the old domain name $old_domain and the new domain name $new_domain are first defined, and then the current URL is obtained through the $_SERVER global variable and the current URL is determined. Is it equal to the old domain name? If so, send a 301 permanent redirect header and redirect the browser to the new domain name.

Summary

Through the above sample code, you can use PHP to implement the domain name redirection function, thereby completing the need to change or associate the website domain name in a more convenient way. In actual development, the code logic can be further improved and security verification added according to specific business needs to ensure the stability and security of the domain name redirection function.

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