note 35699 added to function.preg-match
| From: | mkr at binarywerks dot dk | Date: | Thu, 11 Sep 2003 12:52:39 +0000 |
| Subject: | note 35699 added to function.preg-match | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-56136@lists.php.net to get a copy of this message | ||
A (AFAIK) correct implementation of Ipv4 validation, this one supports optional ranges (CIDR
notation) and it validates numbers from 0-255 only in the address part, and 1-32 only after the /
<?
function valid_ipv4($ip_addr)
{
$num="([0-9]|1?\d\d|2[0-4]\d|25[0-5])";
$range="([1-9]|1\d|2\d|3[0-2])";
if(preg_match("/^$num\.$num\.$num\.$num(\/$range)?$/",$ip_addr))
{
return 1;
}
return 0;
}
$ip_array[] = "127.0.0.1";
$ip_array[] = "127.0.0.256";
$ip_array[] = "127.0.0.1/36";
$ip_array[] = "127.0.0.1/1";
foreach ($ip_array as $ip_addr)
{
if(valid_ipv4($ip_addr))
{
echo "$ip_addr is valid<BR>\n";
}
else
{
echo "$ip_addr is NOT valid<BR>\n";
}
}
?>
----
Manual Page -- http://www.php.net/manual/en/function.preg-match.php
Edit Note -- http://master.php.net/manage/user-notes.php?action=edit+35699
Delete Note -- http://master.php.net/manage/user-notes.php?action=delete+35699&report=yes
Reject Note -- http://master.php.net/manage/user-notes.php?action=reject+35699&report=yes