original_string: public function isLoopback(): bool
      {
          if ($this->is_loopback === null) {
              $this->is_loopback = $this->isIn(static::$loopback_range);
          }
  
          return $this->is_loopback;
      }
code: public function isLoopback(): bool
      {
          if ($this->is_loopback === null) {
              $this->is_loopback = $this->isIn(static::$loopback_range);
          }
  
          return $this->is_loopback;
      }
code_tokens: public function isLoopback ( ) : bool { if ( $ this -> is_loopback === null ) { $ this -> is_loopback = $ this -> isIn ( static :: $ loopback_range ) ; } return $ this -> is_loopback ; }
docstring: Return true if the address is within the loopback range.
  
  @return bool
docstring_tokens: Return true if the address is within the loopback range .