PHP code to copy file from subfolder to root?

[Dhira]

Hi,

Say I have a file in a folder;

[!--quoteo--][div class=\'quotetop\']QUOTE[/div][div class=\'quotemain\'][!--quotec--]www.domain.com/includes/file.txt[/quote]

and I want to move it to

[!--quoteo--][div class=\'quotetop\']QUOTE[/div][div class=\'quotemain\'][!--quotec--]www.domain.com/file.txt (i.e.move it to public_html)
[/quote]
What code do I need to do this? (That will enable it replace a file of the same name if there is one)

Thanks.