(PHP 4, PHP 5)
gethostbynamel — Get a list of IPv4 addresses corresponding to a given Internet host name
$hostname
   )
   Returns a list of IPv4 addresses to which the Internet host
   specified by hostname resolves. 
  
hostname
     The host name.
   Returns an array of IPv4 addresses or FALSE if
   hostname could not be resolved.
  
Example #1 gethostbynamel() example
<?php
$hosts = gethostbynamel('www.example.com');
print_r($hosts);
?>
The above example will output:
Array
(
    [0] => 192.0.34.166
)