protected function quoteIdentifier($identifier)
    {
        if (!is_array($identifier)) {
            return $this->connection->quoteIdentifier($identifier);
        }

        foreach ($identifier as &$value) {
            $value = $this->connection->quoteIdentifier($value);
            unset($value);
        }

        return $identifier;
    }
protected function quoteIdentifier($identifier)
    {
        if (!is_array($identifier)) {
            return $this->connection->quoteIdentifier($identifier);
        }

        foreach ($identifier as &$value) {
            $value = $this->connection->quoteIdentifier($value);
            unset($value);
        }

        return $identifier;
    }
protected function quoteIdentifier ( $ identifier ) { if ( ! is_array ( $ identifier ) ) { return $ this -> connection -> quoteIdentifier ( $ identifier ) ; } foreach ( $ identifier as & $ value ) { $ value = $ this -> connection -> quoteIdentifier ( $ value ) ; unset ( $ value ) ; } return $ identifier ; }
Quotes SQL identifier or array of identifiers

@param string|array $identifier

@return string|array
Quotes SQL identifier or array of identifiers