Reader::readDouble PHP Method

    public function readDouble()
    {
        $tag = $this->stream->getc();
        switch ($tag) {
            case '0':
                return 0.0;
            case '1':
                return 1.0;
            case '2':
                return 2.0;
            case '3':
                return 3.0;
            case '4':
                return 4.0;
            case '5':
                return 5.0;
            case '6':
                return 6.0;
            case '7':
                return 7.0;
            case '8':
                return 8.0;
            case '9':
                return 9.0;
            case Tags::TagInteger:
            case Tags::TagLong:
            case Tags::TagDouble:
                return $this->readDoubleWithoutTag();
            case Tags::TagNaN:
                return log(-1);
            case Tags::TagInfinity:
                return $this->readInfinityWithoutTag();
            default:
                throw $this->unexpectedTag($tag);
        }
    }