code: public function normaliseValue($value, $quote = '')
      {
          if (strlen($quote) == 0) {
              return trim($value);
          }
  
          $value = str_replace("\\$quote", $quote, $value);
          $value = str_replace('\\\\', '\\', $value);
          return $value;
      }
docs: Normalising the value of setter to reading
  
  @param  string $value
  @param  string $quote
  
  @return string