difference between copy and move in php

Copy : copy() function used copy a file in php,this function returns true on success and else failure.
syntax is 
copy(source,destination)


Move :It means moved file in given destination,  If the file is valid, it was uploaded through the php HTTP POST upload mechanism, it will be moved to the filename given by destination.Otherwise no action will occur, and move_uploaded_file() will return FALSE.
syntax is
move_uploaded_file(source,destination)