Validate IPv6 Address

[prabhuram.k]

Can anybody know how to validate IPV4 and IPV6 address in PHP. I am
using PHP 4.2.3 for some compatiability reason.

[Juliette]

pr*********@gmail.com wrote:

Can anybody know how to validate IPV4 and IPV6 address in PHP. I am
using PHP 4.2.3 for some compatiability reason.

// Regex by Daniel Adam
// http://www.regxlib.com/REDetails.aspx?regexp_id=1139
$pattern[ipv4] =
'/^((\d|[1-9]\d|2[0-4]\d|25[0-5]|1\d\d)(?:\.(\d|[1-9]\d|2[0-4]\d|25[0-5]|1\d\d)){3})$/';

// Checks whether a given IPv6 address string could be valid based on
full and compressed IPv6 addresses as defined in RFC 2373 -
http://www.faqs.org/rfcs/rfc2373.html
// Regex by Jeff Johnson
// http://www.regxlib.com/REDetails.aspx?regexp_id=1000
$pattern[ipv6] =
'/^((([0-9A-Fa-f]{1,4}:){7}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){6}:[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){5}:([0-9A-Fa-f]{1,4}:)?[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){4}:([0-9A-Fa-f]{1,4}:){0,2}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){3}:([0-9A-Fa-f]{1,4}:){0,3}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){2}:([0-9A-Fa-f]{1,4}:){0,4}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){6}((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))|(([0-9A-Fa-f]{1,4}:){0,5}:((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))|(::([0-9A-Fa-f]{1,4}:){0,5}((\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b)\.){3}(\b((25[0-5])|(1\d{2})|(2[0-4]\d)|(\d{1,2}))\b))|([0-9A-Fa-f]{1,4}::([0-9A-Fa-f]{1,4}:){0,5}[0-9A-Fa-f]{1,4})|(::([0-9A-Fa-f]{1,4}:){0,6}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){1,7}:))$/';
Pass the value to be tested to the below as $value:

$valid_ipv4 = preg_match( $pattern[ipv4], $value ) ? TRUE : FALSE;

$valid_ipv6 = preg_match( $pattern[ipv6], $value ) ? TRUE : FALSE;
Good luck,
Juliette

[bobzimuta]

why not combine the two ip functions ip2long and long2ip:

from http://us2.php.net/manual/en/function.ip2long.php

<?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"
?>