Implementation principle of PHP's ip2long and long2ip functions_PHP tutorial

I recently wanted to make a reversible conversion of decimal numbers to use as an invitation code. I have never figured out how to do it. It is too complicated. When I was working on IP today, I thought that this could be converted, so I studied the principle:

Mainly organized by myself:

$ip = '12.34.56.78';
$ips = explode('.', $ip);
$result = 0;
$result += $ips[0]<<24;
$result += $ips[1]<<16;
$result += $ips[2]<<8;
$result += $ips[3];
echo bindec(decbin($result));
echo &#39;<br>&#39;;
echo bindec(decbin(ip2long($ip)));
echo &#39;<br>&#39;;

$str = &#39;&#39;;
$str .= intval($result/intval(pow(2, 24))) .&#39;.&#39;;
$str .= intval(($result&0x00FFFFFF)/intval(pow(2, 16))) .&#39;.&#39;;
$str .= intval(($result&0x0000FFFF)/intval(pow(2, 8))) .&#39;.&#39;;
$str .= intval($result&0x000000FF);

echo $str;
echo &#39;<br>&#39;;
echo long2ip($result);

The result of the above output is:

203569230
203569230
12.34.56.78
12.34.56.78

This is just one way to achieve it, there are other ways

I wanted to use a similar method, which can directly convert a decimal number into other decimal values ​​and reversibly, but I found too many problems when encountering values ​​with many 0s in the middle, such as 1000100

http://www.bkjia.com/PHPjc/820633.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/820633.htmlTechArticleI recently wanted to make a reversible conversion of decimal numbers into an invitation code. I haven’t figured out how to do it. It’s too complicated. Yes, when I was getting the IP today, I thought that this could be converted, so I studied the original...