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PHP. Руководство по PHP. 2005

ip2long

ip2long

(PHP 4, PHP 5)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. If ip_address is invalid then

-1 is returned. Note that -1

does not evaluate as FALSE in PHP.

Замечание:

As of PHP 5.0.0 ip2long() returns FALSE when

ip_address is invalid.

Пример 1. ip2long() Example


<?php
$ip = gethostbyname('www.example.com');
$out = "The following URLs are equivalent:<br>\n";
$out .= 'http://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 in both PHP 4 and PHP 5:

Пример 2. Displaying an IP address


<?php
$ip = gethostbyname('www.example.com');
$long = ip2long($ip);

if ($long == -1 || $long === FALSE){
echo 'Invalid IP, please try again';
} else {
echo $ip . "\n"; // 192.0.34.166
echo $long . "\n"; // -1073732954
printf("%u\n", ip2long($ip)); // 3221234342
}
?>

ip2long() should not be used as the sole form

of IP validation. Combine it with long2ip():

Пример 3. IP validation


<?php
// make sure IPs are valid. also converts a non-complete IP into
// a proper dotted quad as explained below.
$ip = long2ip(ip2long("127.0.0.1")); // "127.0.0.1"
$ip = long2ip(ip2long("10.0.0")); // "10.0.0.0"
$ip = long2ip(ip2long("10.0.256")); // "10.0.1.0"
?>

ip2long() will also work with non-complete IP

addresses. Read http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/commtrf2/inet_addr.htm

for more info.

Замечание:

ip2long() will return FALSE for the IP

255.255.255.255 in PHP 5 <= 5.0.2. It was fixed in

PHP 5.0.3 where it returns -1 (same as PHP 4).

See also long2ip() and

inet_pton

Уровень выше

long2ip

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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