PHP file to redirect url's

I have several links on my website which needs to be redirected like this:

How can I make the redirect file?

Any examples,tips etc will be greatly aprpeciated

In your redirect your do a header redirect, once your admin part (?) is done:
header('location:$othersiteurl');

Would you need to use double quotes within the parenthesis?

you mean i should do a header redirect then a .htaccess rewrite rule for that..or?