Leafo\ScssPhp\Compiler::compileStringContent PHP Method

    protected function compileStringContent($string)
    {
        $parts = [];
        foreach ($string[2] as $part) {
            if (is_array($part) || $part instanceof \ArrayAccess) {
                $parts[] = $this->compileValue($part);
            } else {
                $parts[] = $part;
            }
        }
        return implode($parts);
    }