[root@server src]# php -v
4.1.2/ALT
[root@server src]# php -q
<?php
echo gethostbyaddr("192.168.0.1") . "\n";
?>
dwl-2000ap-plus.smg
[root@server src]# php -q
<?php
echo gethostbyname("dwl-2000ap-plus") . "\n";
?>
192.168.0.1
[root@server src]#