What does $func mean and how did it come about?

          $func = 'image'.$type;  
                                                                                  ’ ’s ’ ’s ’ to to ’s' ’s           out out out out out out out out over out over'' ‐‐ ‐‐‐‐‐‐‐‐ and ? _ .'.'.$type;
                                                                                                                                  filename'].'.'.$type;
}
                                                                                                                                 $soruceRes,$path);