(PHP 5 >= 5.1.0)
inet_ntop — Converts a packed internet address to a human readable representation
$in_addr
)This function converts a 32bit IPv4, or 128bit IPv6 address (if PHP was built with IPv6 support enabled) into an address family appropriate string representation.
in_addr
A 32bit IPv4, or 128bit IPv6 address.
Returns a string representation of the address 或者在失败时返回 FALSE.
Example #1 inet_ntop() Example
<?php
$packed = chr(127) . chr(0) . chr(0) . chr(1);
$expanded = inet_ntop($packed);
/* Outputs: 127.0.0.1 */
echo $expanded;
$packed = str_repeat(chr(0), 15) . chr(1);
$expanded = inet_ntop($packed);
/* Outputs: ::1 */
echo $expanded;
?>
| 版本 | 说明 |
|---|---|
| 5.3.0 | This function is now available on Windows platforms. |
PandoraBox2007 at gmail dot com (2011-12-03 21:05:47)
Before inet_pton nice work
//2001:0db8:85a3:0000:0000:8a2e:0370:7334
After
//2001:db8:85a3::8a2e:370:7334
no need compare compress data
string inet_ntop ( string $in_addr [, bool $compress = false] )
---
ryansun81 at gmail dot com (2010-05-27 15:11:21)
For people who wondering what the meaning of this function name:
pton: a presentation(printable) format address to network address
ntop: a network address to presentation(printable) format address
MagicalTux at FF dot st (2005-05-04 04:43:43)
For people who need this function but don't have it, I could write a function which should give almost the same result.
<?php
function my_inet_ntop($ip) {
if (strlen($ip)==4) {
// ipv4
list(,$ip)=unpack('N',$ip);
$ip=long2ip($ip);
} elseif(strlen($ip)==16) {
// ipv6
$ip=bin2hex($ip);
$ip=substr(chunk_split($ip,4,':'),0,-1);
$ip=explode(':',$ip);
$res='';
foreach($ip as $seg) {
while($seg{0}=='0') $seg=substr($seg,1);
if ($seg!='') {
$res.=($res==''?'':':').$seg;
} else {
if (strpos($res,'::')===false) {
if (substr($res,-1)==':') continue;
$res.=':';
continue;
}
$res.=($res==''?'':':').'0';
}
}
$ip=$res;
}
return $ip;
}
?>
I followed IPv6 reprenstation rules :
- A series of "0"s in a 16bit block can by represented by "0".
- A series of blocks containing only "0"s can be suppressed and represented by "::" (this can be done only once)
(source : http://www.ipv6style.jp/en/faq/latest.shtml#2003022112 )
Example:
<?php
$packed = str_repeat(chr(0), 15) . chr(1);
$expanded = my_inet_ntop($packed);
/* Outputs: ::1 */
echo $expanded;
?>
I checked in CVS (2005-04-25) and didn't find the inet_ntop function (I really needed to handle IPv6) so I implemented it myself !
mirko dot steiner at slashdevslashnull dot de (2005-03-23 11:08:00)
i've used this nice one oneline code:
<?PHP
$one = 192;
$two = 168;
$three = 1;
$four = 1;
$ip = $one*pow(256,3) + $two*pow(256,2) + $three*pow(256,1) + $four*pow(256,0);
echo $ip;
?>
you can also put the first one, shift them by 24 bits to the right, take the secod and shift them by 16, the 3rd by 8 and put thouse all together bitwise...