Capture and Modify url.....?

[DSchragg]

I'm wondering how I can use the following code to capture the current url......

 

<?php
function curPageURL() {
$pageURL = 'http';
if ($_SERVER["HTTPS"] == "on") {$pageURL .= "s";}
$pageURL .= "://";
if ($_SERVER["SERVER_PORT"] != "80") {
  $pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
} else {
  $pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
}
return $pageURL;
}
?>

<?php
  echo curPageURL();
?>

 

and then have the output modified to change the domain name and create a link.

Example:

before - http://website1.com/page

after - http://website2.com/page

 

I think this would be done using function modify_url, but I'm not sure how to do it, any help would be greatly appreciated.

 

Thanks