The correct function to validate whether the contents of \\$_FILES[name][tmp_name] have really been uploaded via HTTP and also save the contents into another folder is move_uploaded_file(). The move_uploaded_file() function checks if the file is a valid upload (i.e., it was uploaded via PHP's HTTP POST method) and, if valid, moves it to the specified destination. The is_uploaded_file() function only validates the uploaded file but doesn't move it.