original_string: public function is_accessible() {
          $available = $this->properties->available;
          $deadline = $this->properties->deadline;
          return (($available == 0 || time() >= $available) && ($deadline == 0 || time() < $deadline));
      }
code: public function is_accessible() {
          $available = $this->properties->available;
          $deadline = $this->properties->deadline;
          return (($available == 0 || time() >= $available) && ($deadline == 0 || time() < $deadline));
      }
code_tokens: public function is_accessible ( ) { $ available = $ this -> properties -> available ; $ deadline = $ this -> properties -> deadline ; return ( ( $ available == 0 || time ( ) >= $ available ) && ( $ deadline == 0 || time ( ) < $ deadline ) ) ; }
docstring: Check if the lesson is accessible at the present time
  @return bool True if the lesson is accessible, false otherwise
docstring_tokens: Check if the lesson is accessible at the present time