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gethostbynamel
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gethostbynamel

Name

gethostbynamel — Gets multiple IP addresses for an Internet host.

Synopsis

array gethostbynamel(hostname); string hostname: Internet hostname

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.

Version

PHP Version: 3+, 4+

Example

Example 836. Find the IP addresses for a hostname

<?php
$host = 'www.w3c.org';
$ips = gethostbynamel ($host);

if (0 == count ($ips)) {
    echo "I could not successfully look up <i>$host</i>.";
} else {
    echo 'There are ', count ($ips), " IP address(es) for $host:<ol>";
    foreach ($ips as $ip)
        echo "<li>$ip</li>";
    echo "</ol>";
}
?>

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PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.