Can get move_uploaded_file to work

Question

Cant seem to make php move_uploaded_file function to work.

                  $MAX_FILESIZE = 5 * 1024 * 1024;
                  $rEFileTypes = "/^\.(jpg|jpeg|gif|png|pdf|xls|xlsx|ppt|pptx){1}$/i";
                  $isFile = is_uploaded_file($_FILES["prodImage"]["tmp_name"]);
                 if($isFile)
                  {
                      echo "inside first if";
                      $safe_filename = preg_replace(array("/\s+/", "/[^-\.\w]+/"), array("_", ""), trim($_FILES["prodImage"]["name"])); 
                      if($_FILES["prodImage"]["size"] <= $MAX_FILESIZE && preg_match($rEFileTypes, strrchr($safe_filename, '.')))
                      {
                          echo "inside second if";
                          $isMove = move_uploaded_file($_FILES["prodImage"]["tmp_name"], $to);

                          if($isMove)
                          {
                              echo "Uploaded Succesfully";
                          }
                      }
                      else
                      {
                          echo "image is too big";
                      }
                  }
                  else
                  {
                      echo "nuthing mega";
                  }

Can someone tell me why first condition always fails? I have a file type in a form with a name 'prodImage' and i specified correctly the enctype.