original_string: public function getServiceNameById($id)
      {
          $map = $this->getServiceIdNameMap();
          if (array_key_exists($id, $map)) {
              return $map[$id];
          }
  
          return null;
      }
code: public function getServiceNameById($id)
      {
          $map = $this->getServiceIdNameMap();
          if (array_key_exists($id, $map)) {
              return $map[$id];
          }
  
          return null;
      }
code_tokens: public function getServiceNameById ( $ id ) { $ map = $ this -> getServiceIdNameMap ( ) ; if ( array_key_exists ( $ id , $ map ) ) { return $ map [ $ id ] ; } return null ; }
docstring: Get a service name by its identifier.
  
  @param  int $id
  
  @return string
docstring_tokens: Get a service name by its identifier .