How can I split the following and redirect?

[networkthis]

I need to achieve the following.....I am trying to take the following Example:

 

http://www.example.com/user1/files?path=file1

 

and redirect if the user trys to type in a different path

 

Example: http://www.example.com/user2/files

 

I was thinking if $url !== http://www.example.com/user1/files then to redirect with headers.  Everything I keep trying doesn't work...Any Ideas/maybe an example???

 

Thank you

 

 

 

[networkthis]

I do not want users to stray from their files...... Is it possible to do a redirect if the user types a direct url up top that is not equal to http://www.example.com/user/files --- which they are logged in under?