Sphinx\SphinxClient::unpackU64 PHP Method

    public function unpackU64($v)
    {
        list($hi, $lo) = array_values(unpack('N*N*', $v));
        if (PHP_INT_SIZE >= 8) {
            if ($hi < 0) {
                // because php 5.2.2 to 5.2.5 is totally fucked up again
                $hi += 1 << 32;
            }
            if ($lo < 0) {
                $lo += 1 << 32;
            }
            // x64, int
            if ($hi <= 2147483647) {
                return ($hi << 32) + $lo;
            }
            // x64, bcmath
            if (function_exists('bcmul')) {
                return bcadd($lo, bcmul($hi, '4294967296'));
            }
            // x64, no-bcmath
            $c = 100000;
            $h = ((int) ($hi / $c) << 32) + (int) ($lo / $c);
            $l = ($hi % $c << 32) + $lo % $c;
            if ($l > $c) {
                $h += (int) ($l / $c);
                $l = $l % $c;
            }
            if ($h == 0) {
                return $l;
            }
            return sprintf('%d%05d', $h, $l);
        }
        // x32, int
        if ($hi == 0) {
            if ($lo > 0) {
                return $lo;
            }
            return sprintf('%u', $lo);
        }
        $hi = sprintf('%u', $hi);
        $lo = sprintf('%u', $lo);
        // x32, bcmath
        if (function_exists('bcmul')) {
            return bcadd($lo, bcmul($hi, '4294967296'));
        }
        // x32, no-bcmath
        $hi = (double) $hi;
        $lo = (double) $lo;
        $q = floor($hi / 10000000.0);
        $r = $hi - $q * 10000000.0;
        $m = $lo + $r * 4967296.0;
        $mq = floor($m / 10000000.0);
        $l = $m - $mq * 10000000.0;
        $h = $q * 4294967296.0 + $r * 429.0 + $mq;
        $h = sprintf('%.0f', $h);
        $l = sprintf('%07.0f', $l);
        if ($h == '0') {
            return sprintf('%.0f', (double) $l);
        }
        return $h . $l;
    }

 /**
  * @dataProvider provideBigintUnsigned
  */
 public function testPackBigintUnsigned($bigint)
 {
     $sphinx = new SphinxClient();
     // packing and unpacking may not preserve data type
     $this->assertEquals($sphinx->unpackU64($sphinx->packU64($bigint)), $bigint);
 }