Dotenv\Loader::sanitiseVariableValue PHP 메소드

    protected function sanitiseVariableValue($name, $value)
    {
        $value = trim($value);
        if (!$value) {
            return array($name, $value);
        }
        if ($this->beginsWithAQuote($value)) {
            // value starts with a quote
            $quote = $value[0];
            $regexPattern = sprintf('/^
                %1$s          # match a quote at the start of the value
                (             # capturing sub-pattern used
                 (?:          # we do not need to capture this
                  [^%1$s\\\\] # any character other than a quote or backslash
                  |\\\\\\\\   # or two backslashes together
                  |\\\\%1$s   # or an escaped quote e.g \\"
                 )*           # as many characters that match the previous rules
                )             # end of the capturing sub-pattern
                %1$s          # and the closing quote
                .*$           # and discard any string after the closing quote
                /mx', $quote);
            $value = preg_replace($regexPattern, '$1', $value);
            $value = str_replace("\\{$quote}", $quote, $value);
            $value = str_replace('\\\\', '\\', $value);
        } else {
            $parts = explode(' #', $value, 2);
            $value = trim($parts[0]);
            // Unquoted values cannot contain whitespace
            if (preg_match('/\\s+/', $value) > 0) {
                throw new InvalidFileException('Dotenv values containing spaces must be surrounded by quotes.');
            }
        }
        return array($name, trim($value));
    }