Diese Seite bei php.net
The PHP manual text and comments are covered by the Creative Commons Attribution 3.0 License © the PHP Documentation Group - Impressum - mail("TO:Reinhard Neidl",...)
(PHP 5 >= 5.1.0)
inet_pton — Konvertiert eine IP-Adresse im menschenlesbaren Format in eine komprimierte in_addr-Repräsentation
Die Funktion konvertiert eine menschenlesbare IPv4- oder IPv6-Adresse (sofern PHP mit IPv6-Support kompiliert wurde) in eine für die Adressfamilie geeignete 32-bittige oder 128-bittige Binärstruktur.
Eine menschenlesbare IPv4- oder IPv6-Adresse.
Gibt die in_addr-Representation der übergebenen address zurück.
Beispiel #1 inet_pton()-Beispiel
<?php
$in_addr = inet_pton('127.0.0.1');
$in6_addr = inet_pton('::1');
?>
| Version | Beschreibung |
|---|---|
| 5.3.0 | Die Funktion steht jetzt auch auf Windowsplattformen zur Verfügung. |
If the input string is not a readable IP address, inet_pton() generates an E_WARNING and returns FALSE. The same is true for inet_ntop().
Also, inet_pton() does not recognize netmask notation (e.g: "1.2.3.4/24" or "1:2::3:4/64") in the input string. This differs from how some database systems (like postgreSQL) support IP address types, so if you need that sort of functionality when processing IP addresses in PHP you'll have to write it in yourself.
A rough example:
<?php
// Sample IP addresses
$ipaddr = '1.2.3.4/24'; // IPv4 with /24 netmask
$ipaddr = '1:2::3:4/64'; // IPv6 with /64 netmask
// Strip out the netmask, if there is one.
$cx = strpos($ipaddr, '/');
if ($cx)
{
$subnet = (int)(substr($ipaddr, $cx+1));
$ipaddr = substr($ipaddr, 0, $cx);
}
else $subnet = null; // No netmask present
// Convert address to packed format
$addr = inet_pton($ipaddr);
// Let's display it as hexadecimal format
foreach(str_split($addr) as $char) echo str_pad(dechex(ord($char)), 2, '0', STR_PAD_LEFT);
echo "<br />\n";
// Convert the netmask
if (is_integer($subnet))
{
// Maximum netmask length = same as packed address
$len = 8*strlen($addr);
if ($subnet > $len) $subnet = $len;
// Create a hex expression of the subnet mask
$mask = str_repeat('f', $subnet>>2);
switch($subnet & 3)
{
case 3: $mask .= 'e'; break;
case 2: $mask .= 'c'; break;
case 1: $mask .= '8'; break;
}
$mask = str_pad($mask, $len>>2, '0');
// Packed representation of netmask
$mask = pack('H*', $mask);
}
// Display the netmask as hexadecimal
foreach(str_split($mask) as $char) echo str_pad(dechex(ord($char)), 2, '0', STR_PAD_LEFT);
?>
Not so easy in the function below... It is not handling the case of '::' which can happen in an IPv6 and represents any number of 0, addresses could be as simple as ff05::1
If you want to use the above function you should test for ':' character before '.'. Meaning, you should check if it's an ipv6 address before checking for ipv4.
Why? IPv6 allows this type of notation:
::127.0.0.1
If you check for '.' character you will think this is an ipv4 address and it will fail.
If you need the functionality but your PHP version doesn't have the functionality (like on windows) the following might help
<?php
function inet_pton($ip)
{
# ipv4
if (strpos($ip, '.') !== FALSE) {
$ip = pack('N',ip2long($ip));
}
# ipv6
elseif (strpos($ip, ':') !== FALSE) {
$ip = explode(':', $ip);
$res = str_pad('', (4*(8-count($ip))), '0000', STR_PAD_LEFT);
foreach ($ip as $seg) {
$res .= str_pad($seg, 4, '0', STR_PAD_LEFT);
}
$ip = pack('H'.strlen($res), $res);
}
return $ip;
}
?>
Diese Seite bei php.net