PMA\libraries\Util::unQuote PHP Method

    public static function unQuote($quoted_string, $quote = null)
    {
        $quotes = array();
        if ($quote === null) {
            $quotes[] = '`';
            $quotes[] = '"';
            $quotes[] = "'";
        } else {
            $quotes[] = $quote;
        }
        foreach ($quotes as $quote) {
            if (mb_substr($quoted_string, 0, 1) === $quote && mb_substr($quoted_string, -1, 1) === $quote) {
                $unquoted_string = mb_substr($quoted_string, 1, -1);
                // replace escaped quotes
                $unquoted_string = str_replace($quote . $quote, $quote, $unquoted_string);
                return $unquoted_string;
            }
        }
        return $quoted_string;
    }

 /**
  * Prepare sorted column message
  *
  * @param integer &$dt_result                  the link id associated to the
  *                                              query which results have to
  *                                              be displayed
  * @param string  $sort_expression_nodirection sort expression without direction
  *
  * @return  string                              html content
  *          null                                if not found sorted column
  *
  * @access  private
  *
  * @see     getTable()
  */
 private function _getSortedColumnMessage(&$dt_result, $sort_expression_nodirection)
 {
     $fields_meta = $this->__get('fields_meta');
     // To use array indexes
     if (empty($sort_expression_nodirection)) {
         return null;
     }
     if (mb_strpos($sort_expression_nodirection, '.') === false) {
         $sort_table = $this->__get('table');
         $sort_column = $sort_expression_nodirection;
     } else {
         list($sort_table, $sort_column) = explode('.', $sort_expression_nodirection);
     }
     $sort_table = Util::unQuote($sort_table);
     $sort_column = Util::unQuote($sort_column);
     // find the sorted column index in row result
     // (this might be a multi-table query)
     $sorted_column_index = false;
     foreach ($fields_meta as $key => $meta) {
         if ($meta->table == $sort_table && $meta->name == $sort_column) {
             $sorted_column_index = $key;
             break;
         }
     }
     if ($sorted_column_index === false) {
         return null;
     }
     // fetch first row of the result set
     $row = $GLOBALS['dbi']->fetchRow($dt_result);
     // initializing default arguments
     $default_function = 'PMA_mimeDefaultFunction';
     $transformation_plugin = $default_function;
     $transform_options = array();
     // check for non printable sorted row data
     $meta = $fields_meta[$sorted_column_index];
     if (stristr($meta->type, self::BLOB_FIELD) || $meta->type == self::GEOMETRY_FIELD) {
         $column_for_first_row = $this->_handleNonPrintableContents($meta->type, $row[$sorted_column_index], $transformation_plugin, $transform_options, $default_function, $meta);
     } else {
         $column_for_first_row = $row[$sorted_column_index];
     }
     $column_for_first_row = mb_strtoupper(mb_substr($column_for_first_row, 0, $GLOBALS['cfg']['LimitChars']) . '...');
     // fetch last row of the result set
     $GLOBALS['dbi']->dataSeek($dt_result, $this->__get('num_rows') - 1);
     $row = $GLOBALS['dbi']->fetchRow($dt_result);
     // check for non printable sorted row data
     $meta = $fields_meta[$sorted_column_index];
     if (stristr($meta->type, self::BLOB_FIELD) || $meta->type == self::GEOMETRY_FIELD) {
         $column_for_last_row = $this->_handleNonPrintableContents($meta->type, $row[$sorted_column_index], $transformation_plugin, $transform_options, $default_function, $meta);
     } else {
         $column_for_last_row = $row[$sorted_column_index];
     }
     $column_for_last_row = mb_strtoupper(mb_substr($column_for_last_row, 0, $GLOBALS['cfg']['LimitChars']) . '...');
     // reset to first row for the loop in _getTableBody()
     $GLOBALS['dbi']->dataSeek($dt_result, 0);
     // we could also use here $sort_expression_nodirection
     return ' [' . htmlspecialchars($sort_column) . ': <strong>' . htmlspecialchars($column_for_first_row) . ' - ' . htmlspecialchars($column_for_last_row) . '</strong>]';
 }