RE: [PHP] basic authentication and redirection

[snip]
In certain circumstances controlled by my users, I'd like to redirect 
my users to another site, a third party whom we have contracted with. 
The second site uses basic authentication with a simple username and 
password. Can I write my PHP code so my users do not have to login 
(or even know the username/password) on the remote site?

This isn't intended to stop serious hackers, just enough security to 
stop casual passers-by.
[/snip]

Have a look at cURL (http://www.php.net/curl) as it will allow you to
perform remote POST's which may be enough to get you through.