original_string: private function query($sql) {
  		if ($sth = $this->DB->query($sql)) {
  			$res = $sth->fetchAll(PDO::FETCH_COLUMN);
  		} else {
  			$res = false;
  		}
  		return $res;
  	}
code: private function query($sql) {
  		if ($sth = $this->DB->query($sql)) {
  			$res = $sth->fetchAll(PDO::FETCH_COLUMN);
  		} else {
  			$res = false;
  		}
  		return $res;
  	}
code_tokens: private function query ( $ sql ) { if ( $ sth = $ this -> DB -> query ( $ sql ) ) { $ res = $ sth -> fetchAll ( PDO :: FETCH_COLUMN ) ; } else { $ res = false ; } return $ res ; }
docstring: DB query and fetchAll
  
  @param string $sql
  @return boolean|array
docstring_tokens: DB query and fetchAll