PHP检查IPAddress是否是本地的

Question

Can i check if an ip is in a private network?

<?php
function isLocalIPAddress($IPAddress)
{
    return ( !filter_var($IPAddress, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE ) );
}

var_dump( isLocalIPAddress('127.0.0.1') ); // false
var_dump( isLocalIPAddress('192.168.1.20') ); // true
var_dump( isLocalIPAddress('64.233.160.0') ); // false

Why is isLocalIPAddress('127.0.0.1') giving false instead of true ?

Isn't 127.0.0.1 a private ip?

---

UPDATE

Solution I used:

<?php
function isLocalIPAddress($IPAddress)
{
    if( strpos($IPAddress, '127.0.') === 0 )
        return true;

    return ( !filter_var($IPAddress, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE ) );
}

Answer 1

According to a test run , we can see that output for PHP 5.2.0 → 5.3.5 is false , while output for PHP 5.3.6 → 7.0.0beta1 and hhvm-3.3.1 → 3.8.0 is true .

To solve your problem you can check for php version and if it is in the first range add:

function isLocalIPAddress($IPAddress)
{
    if($IPAddress == '127.0.0.1'){return true;} <-- add this
    return ( !filter_var($IPAddress, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE ) );
}

Answer 2

filter_var($addr, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE);

This is my production flags. Private IP classes and loopback interfaces are not allowed here.

Answer 3

According to http://www.php.net/manual/en/filter.filters.flags.php 127.0.0.1 is not included in either FILTER_FLAG_NO_PRIV_RANGE or FILTER_FLAG_NO_RES_RANGE.

Edit:

There is also a comment there on how to deal with loopback.