Description
bool 
move_uploaded_file ( string filename, string destination )
     This function checks to ensure that the file designated by
     filename is a valid upload file (meaning
     that it was uploaded via PHP's HTTP POST upload mechanism). If
     the file is valid, it will be moved to the filename given by
     destination.
    
     If filename is not a valid upload file,
     then no action will occur, and
     move_uploaded_file() will return
     FALSE. 
    
     If filename is a valid upload file, but
     cannot be moved for some reason, no action will occur, and
     move_uploaded_file() will return
     FALSE. Additionally, a warning will be issued.
    
     This sort of check is especially important if there is any chance
     that anything done with uploaded files could reveal their
     contents to the user, or even to other users on the same
     system.
    
Note: 
      move_uploaded_file() is both safe mode
      and open_basedir
      aware. However, restrictions are placed only on the
      destination path as to allow the moving
      of uploaded files in which filename may conflict
      with such restrictions. move_uploaded_file() ensures
      the safety of this operation by allowing only those files uploaded
      through PHP to be moved.
     
| Warning | 
      If the destination file already exists, it will be overwritten.
       | 
     See also is_uploaded_file(), and the section
     Handling file uploads
     for a simple usage example.