PHP Functions Essential Reference

gethostbynamel

array gethostbynamel(string hostname) 

Gets multiple IP addresses for an Internet host.

Returns:

Array of IP addresses

Description:

gethostbynamel() performs a DNS lookup of an Internet hostname and returns a list of corresponding IP addresses. This is useful for Web sites that use “round-robin DNS”—a form of load-balancing whereby one domain name resolves to multiple IP addresses. If no IP address can be found for the specified hostname, the function returns an empty array.

Availability:

UNIX, Windows

Version:

3+, 4+

See also:

gethostbyaddr() 
gethostbyname() 

Example:

23.7. Find the IP addresses for a hostname

<?php $host = 'www.w3c.org'; $ips = gethostbynamel ($host); if (0 == count ($ips)) { echo "I could not successfully ...