Руководство по PHP
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ip2long

(PHP 4 )

ip2long --  Converts a string containing an (IPv4) Internet Protocol dotted address into a proper address.

Description

int ip2long ( string ip_address)

The function ip2long() generates an IPv4 Internet network address from its Internet standard format (dotted string) representation.

Пример 1. ip2long() Example

<?php
$ip = gethostbyname("www.example.com");
$out = "The following URLs are equivalent:<br>\n";
$out .= "http://www.example.com/, http://".$ip."/, and http://".sprintf("%u",ip2long($ip))."/<br>\n";
echo $out;
?>

Замечание: Because PHP's integer type is signed, and many IP addresses will result in negative integers, you need to use the "%u" formatter of sprintf() or printf() to get the string representation of the unsigned IP address.

This second example shows how to print a converted address with the printf() function :

Пример 2. Displaying an IP address

<?php
$ip = gethostbyname("www.example.com");
printf("%u\n", ip2long($ip));
echo $out;
?>

See also: long2ip()

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