long2ip()

(PHP 4, PHP 5, PHP 7)

将长整型转化为字符串形式带点的互联网标准格式地址（IPV4）

说明

long2ip()函数通过长整型的表达形式转化生成带点格式的互联网地址（例如：aaa.bbb.ccc.ddd ）。

参数

合格的地址，长整型的表达形式。

返回值

返回字符串的互联网 IP 地址。

更新日志

注释

在 32 位架构中，从string转换integer整型形式的 ip 地址将有可能导致错误的结果，因为结果数字超出了PHP_INT_MAX限制。

参见

• ip2long() 将 IPV4 的字符串互联网协议转换成长整型数字

If the function doesn't exist: 

Use these two functions to convert from and to numbers compatible to MySQLs INET_ATON and INET_NTOA 

I wanted to be able to pass an IP address in a URL always as an unsigned int. I then converted it back as shown below:
$ip_addr = "192.168.100.25"; // example IP address that converts to neg #
$s32int = ip2long($ip_addr);
$us32str = sprintf("%u",$s32int);        // convert to unsigned string
// display orig IP address, signed 32 bit version, unsigned 32 bit ver, 
// finally converted back to IP addr
printf("%s ,%d, %s, %s", $ip_addr, $s32int, $us32str, 
     long2ip(-(4294967296-$us32str)));
// tested on Linux/Apache PHP 4.1.2

If you're running a 32 bit machine you can get wrong IPs. To prevent from this just cast to float e.g. 

For a 32bit safe long2ip, which can accept string or signed integer input, try:
 function safelong2ip($long) {
  $binStr = sprintf("%032s", decbin((float)$long));
  if (strlen($binStr) != 32) {
   throw new Exception("Invalid IPv4 subnet!");
  }
  $ipArr = [];
  for ($i = 0; $i 
when importing ip-ranges to a mysql database using an INT(10) field - NOTE: that you will get problems when using intval() function!
copied from "cleong" : 02-Oct-2001 02:21
intval() handles overflow differently depending on the type of the argument. 
Beware when processing values that are invalid, you may get values that are different based on the OS. For instance:
$ip = long2ip(pow(2,32)+1024);
On windows you get 255.255.255.255. On linux it's 0.0.4.0.
So it seems it would be important to make sure the long you're converting is in the correct range.
 

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