original_string: public function queryAndFetchOne($sql, &$values=array())
  	{
  		$sth = $this->query($sql, $values);
  		$row = $sth->fetch(PDO::FETCH_NUM);
  		return $row[0];
  	}
code: public function queryAndFetchOne($sql, &$values=array())
  	{
  		$sth = $this->query($sql, $values);
  		$row = $sth->fetch(PDO::FETCH_NUM);
  		return $row[0];
  	}
code_tokens: public function queryAndFetchOne ( $ sql , & $ values = array ( ) ) { $ sth = $ this -> query ( $ sql , $ values ) ; $ row = $ sth -> fetch ( PDO :: FETCH_NUM ) ; return $ row [ 0 ] ; }
docstring: Execute a query that returns maximum of one row with one field and return it.
  
  @param string $sql Raw SQL string to execute.
  @param array &$values Optional array of values to bind to the query.
  @return string
docstring_tokens: Execute a query that returns maximum of one row with one field and return it .