Ip Address Conversion In Php

The purpose of this technote is to provide a small recipe for manipulating and/or converting IP addresses to decimals and back. I wrote a similar technote on how to do this in the Perl language. I thought it would be just as useful to know how to do the same thing in PHP. PHP has a few built-in functions but use of these functions may not yield the desired results.
The PHP function ip2long( string ip_address) is a built-in function that will return an integer. PHP’s Integer type is signed, so many IP addresses will result in a negetive number.

ip2long Example:

< ?php
$long_a = ip2long('10.0.0.1');
$long_b= ip2long('192.168.0.1');
?>

Code (markup):

In this example, $long_a = -1062731775 and $long_b = 167772161. A good way to resolve this issue of signed vs unsigned is to make your own function to do it for you. The following function and example are shown below:
ip2dec function

< ?php
$long_a = ip2dec('10.0.0.1');
$long_b= ip2dec('192.168.0.1');
function ip2dec($ip) {
return (double)(sprintf("%u", ip2long($ip)));
}
?>

Code (markup):

Wow, much different results! $long_a still eqals 167772161. But look at $long_b! $long_b = 3232235521. By the way, this is how the PEAR module Net_IPv4 function Net_IPv4::ip2double does it. The PHP on-line docs also make mention that you may have to use printf or sprintf to get the desired results.

123tweak.com​

 

For what purpose did you post it? i don't see a real question.

And the code code, its given by the php page (http://php.net/manual/en/function.ip2long.php)

$ip = sprintf("%u", ip2long(long2ip(ip2long($_SERVER['REMOTE_ADDR']))));

PHP: