original_string: public function getRoughDistance($clientLng, $clientLat, $poiLng, $poiLat)
      {
          $result = abs($clientLng - $poiLng) + abs($clientLat - $poiLat);
          $this->BackyardError->log(5, "client({$clientLng}, {$clientLat}) poi({$poiLng}, {$poiLat}) roughDistance = {$result}");
          return $result;
      }
code: public function getRoughDistance($clientLng, $clientLat, $poiLng, $poiLat)
      {
          $result = abs($clientLng - $poiLng) + abs($clientLat - $poiLat);
          $this->BackyardError->log(5, "client({$clientLng}, {$clientLat}) poi({$poiLng}, {$poiLat}) roughDistance = {$result}");
          return $result;
      }
code_tokens: public function getRoughDistance ( $ clientLng , $ clientLat , $ poiLng , $ poiLat ) { $ result = abs ( $ clientLng - $ poiLng ) + abs ( $ clientLat - $ poiLat ) ; $ this -> BackyardError -> log ( 5 , "client({$clientLng}, {$clientLat}) poi({$poiLng}, {$poiLat}) roughDistance = {$result}" ) ; return $ result ; }
docstring: 1 ~ 100km
  @param float $clientLng
  @param float $clientLat
  @param float $poiLng
  @param float $poiLat
  @return float
docstring_tokens: 1 ~ 100km