inet_ntop()
(PHP 5 >= 5.1.0, PHP 7)
Converts a packed internet address to a human readable representation
说明
inet_ntop(string $in_addr): string
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 #1inet_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
long2ip()
将长整型转化为字符串形式带点的互联网标准格式地址(IPV4)ip2long()
将 IPV4 的字符串互联网协议转换成长整型数字inet_pton()
Converts a human readable IP address to its packed in_addr representation
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
PHP's inet_ntop function is not compatible with the binary representation used by MySQL's INET6_ATON function, assuming you are using the recommended method of storing both IPv4 and IPv6 addresses in a VARBINARY(16) field. You need to convert it like this: /** * Convert a MySQL binary v4 (4-byte) or v6 (16-byte) IP address to a printable string. * @param string $ip A binary string containing an IP address, as returned from MySQL's INET6_ATON function * @return string Empty if not valid. */ function inet6_ntop($ip) { $l = strlen($ip); if ($l == 4 or $l == 16) { return inet_ntop(pack('A' . $l, $ip)); } return ''; } You don't need a function going the other way because MySQL's INET6_NTOA is already compatible with PHP's inet_pton function.
For people who need this function but don't have it, I could write a function which should give almost the same result. <?php function my_inet_ntop($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 !
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] ) ---