Alternate of window.location.origin in PHP

Question

I want to redirect the domain1.com/abc to domain2.com/abc without changing /abc it should be the same but only domain should change. I mean after / everything should be same only the domain before / should be changed to domain2. Like I do using script:-

<script>
  window.location.href = window.location.href.replace(window.location.origin,&quot;https://www.domain2.com&quot;) 
</script>

<script>
  window.location.href = window.location.href.replace(window.location.origin,&quot;https://www.domain2.com&quot;) 
</script>

Answer 1

Use the Location HTTP header.

Build the header value with a requested domain and a value of $_SERVER['REQUEST_URI'] value:

<?php

$domain = 'http://domain2.com';
$location = $domain . $_SERVER['REQUEST_URI'];
header('Location: ' . $location);