original_string: public function clean($delay = self::CLEAN_DELAY)
      {
          $delay += self::CACHE_TIME;
          $query = $this->pdo->prepare(<<<SQL
  DELETE FROM robotstxt__cache1
  WHERE nextUpdate < (UNIX_TIMESTAMP() - :delay);
  SQL
          );
          $query->bindValue('delay', $delay, \PDO::PARAM_INT);
          return $query->execute();
      }
code: public function clean($delay = self::CLEAN_DELAY)
      {
          $delay += self::CACHE_TIME;
          $query = $this->pdo->prepare(<<<SQL
  DELETE FROM robotstxt__cache1
  WHERE nextUpdate < (UNIX_TIMESTAMP() - :delay);
  SQL
          );
          $query->bindValue('delay', $delay, \PDO::PARAM_INT);
          return $query->execute();
      }
code_tokens: public function clean ( $ delay = self :: CLEAN_DELAY ) { $ delay += self :: CACHE_TIME ; $ query = $ this -> pdo -> prepare ( <<<SQL
  DELETE FROM robotstxt__cache1
  WHERE nextUpdate < (UNIX_TIMESTAMP() - :delay);
  SQL ) ; $ query -> bindValue ( 'delay' , $ delay , \ PDO :: PARAM_INT ) ; return $ query -> execute ( ) ; }
docstring: Clean the cache table
  
  @param int $delay
  @return bool
docstring_tokens: Clean the cache table