note 56413 modified in function.ip2long by danbrown
| From: | danbrown@php.net | Date: | Fri, 05 Dec 2008 13:41:08 +0000 |
| Subject: | note 56413 modified in function.ip2long by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-147695@lists.php.net to get a copy of this message | ||
<?php
# m.ozarek
#
# Check if given mask is correct. You can check the short format mask
# like 8,16,24 or long format like 255.255.255.0
#
function isIpMask($mask){
$format = '';
if(preg_match("/[0-9]++\.[0-9]++\.[0-9]++\.[0-9]++/",$mask)){
$format = "long";
}else{
if($mask<=30){
$format = "short";
}else{
return false;
}
}
switch($format){
case long;
$mask = decbin(ip2long($mask));
break;
case short:
$tmp = $mask;
for($i=0; $i < $mask ;$i++){
$tmp.= 1;
}
for($j=0; $j < (32 - $mask);$j++){
$tmp.= 0;
}
$mask = $tmp;
break;
}
if(strlen($mask) <= 32){
for($i=0;$i<=32 ;$i++){
$bit = substr($mask,$i,1);
if(($bit - substr($mask,$i+1,1)) < 0){
return false;
}
}
}
return true;
}
# EXAMPLE
# isIpMask("255.255.255.0") -> return true
# isIpMask("24") -> return true
# isIpMask("5.5.5.5") -> return false
?>
[EDIT BY danbrown AT php DOT net: Contains a fix provided by (greg AT netops DOT gvtc DOT com) on
19-Dec-2005.]
--was--
<?php
# m.ozarek
#
# Check if given mask is correct. You can check the short format mask
# like 8,16,24 or long format like 255.255.255.0
#
function isIpMask($mask){
$format = '';
if(preg_match("/[0-9].[0-9].[0-9].[0-9]/",$mask)){
$format = "long";
}else{
if($mask<=30){
$format = "short";
}else{
return false;
}
}
switch($format){
case long;
$mask = decbin(ip2long($mask));
break;
case short:
$tmp = $mask;
for($i=0; $i < $mask ;$i++){
$tmp.= 1;
}
for($j=0; $j < (32 - $mask);$j++){
$tmp.= 0;
}
$mask = $tmp;
break;
}
if(strlen($mask) <= 32){
for($i=0;$i<=32 ;$i++){
$bit = substr($mask,$i,1);
if(($bit - substr($mask,$i+1,1)) < 0){
return false;
}
}
}
return true;
}
# EXAMPLE
# isIpMask("255.255.255.0") -> return true
# isIpMask("24") -> return true
# isIpMask("5.5.5.5") -> return false
?>
http://php.net/manual/en/function.ip2long.php