Network 函数
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inet_ntop

(PHP 5 >= 5.1.0)

inet_ntop — Converts a packed internet address to a human readable representation

说明

string inet_ntop ( string $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.

参数

in_addr

A 32bit IPv4, or 128bit IPv6 address.

返回值

Returns a string representation of the address 或者在失败时返回 FALSE.

范例

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;
?>

更新日志

版本 说明
5.3.0 This function is now available on Windows platforms.

参见

Network 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Converts a packed internet address to a human readable representation

用户评论:

PandoraBox2007 at gmail dot com (04-Dec-2011 05:05)

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 (27-May-2010 11:11)

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 (04-May-2005 12:43)

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 (23-Mar-2005 07:08)

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...