Description:
------------
---
From manual page: http://www.php.net/function.gethostbyaddr
---

In "Return Values" we read:

«Returns the host name or the unmodified ip_address on failure.»
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

However, there are situations where the function appears to return FALSE on failure.

Test script:
---------------
<?php

// Return unmodified argument
var_dump( gethostbyaddr(33) );
var_dump( gethostbyaddr('192.168.0.100') ); // Non-existing LAN address

// Return FALSE and trigger a warning
var_dump( gethostbyaddr(NULL) );
var_dump( gethostbyaddr('php.net') );



Expected result:
----------------
string(2) "33"
string(13) "192.168.0.100"
string(0): ""
string(7): "php.net"

Actual result:
--------------
string(2) "33"
string(13) "192.168.0.100"

Warning: gethostbyaddr(): Address is not a valid IPv4 or IPv6 address in C:\tmp\test.php on line 8
bool(false)

Warning: gethostbyaddr(): Address is not a valid IPv4 or IPv6 address in C:\tmp\test.php on line 9
bool(false)