Protobuf\Binary\Platform\GmpNegativeEncoder::encodeVarint PHP Метод

    public function encodeVarint($varint)
    {
        $bytes = [];
        $value = $this->is32Bit ? gmp_and($varint, '0x0ffffffffffffffff') : sprintf('%u', $varint);
        while (gmp_cmp($value, $this->gmp_x00) > 0) {
            $bytes[] = gmp_intval(gmp_and($value, $this->gmp_x7f)) | 0x80;
            $value = gmp_div_q($value, $this->gmp_x80);
        }
        return $bytes;
    }