inet_ntop

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

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

说明

inet_ntop(string $ip): string|false

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

ip: 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.

示例

示例 #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;
?>

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

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ryansun81 at gmail dot com ¶

14 years ago

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

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marcus at synchromedia dot co dot uk ¶

9 years ago

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.