In PHP, you can use header function and create 301 redirect.

Here is a sample snippet.

Update:

<pre class="wp-block-code">```
<?php header('Location: http://example.com', true, 301);  ?>

The code below is an older version of this post.

```


```
```

This will redirect the PHP page you have added this into `example.com`, you can change `example.com` to any domain you prefer, you can do the same to file with extensions and subdomain.

Thanks to, Christian Häusler for the tip.

Thank you for reading.