How to send POST data to the external URL and open the target URL

I want to send the POST data to the given external url like http://www.example.com/catchPostData.php, where the catchPostData.php looks like this:

<?php
echo $_POST['somedata'];
?>

and open this url with the data I've send.

I've tryed to use cURL, but it returns from the given url, and I want to stay there!

Can anybody help me with this?

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I think you're looking for something like this: PHP Redirect with POST data

You will need a second page, that submits the post data to a completely different url.