getmxrr
Name
getmxrr — Gets the MX records for a host.
Synopsis
bool getmxrr(host, mx_hosts[, mx_host_weights]);
string host: Hostname or IP
address
array reference mx_hosts:
Reference to a variable that will store the array of MX
hostnames
array reference mx_host_weights (optional): Reference
to a variable that will store the array of MX host
weights
Returns
TRUE on success; FALSE on error
Description
getmxrr() performs an MX lookup on the specified
hostname and returns TRUE on success. Arrays of
the MX hostnames and weights are placed in the mx_hosts and mx_host_weights arguments. Both the mx_hosts and mx_host_weights arguments must be passed
as references, as in
&$mx_hostsand&$mx_host_weights.
The weights indicate which MX host to try first, starting
with the lowest value.
In addition to getting MX record information for a host,
this function can also be useful for confirming the
existence of an email address's domain name, regardless
of whether it has an IP address.
Example
Example 837. Get the MX hosts
and host weights for a hostname
<ul>
<?php
$host = 'yahoo.com';
getmxrr ($host, &$mx_hosts, &$host_wt)
or die ("No MX records could be found for <i>$host</i>");
for ($ndx = 0; $ndx < count ($mx_hosts); $ndx++)
$mx_host["$host_wt[$ndx]"] = $mx_hosts[$ndx];
ksort ($mx_host);
foreach ($mx_host as $key => $val)
print "<li><b>Host:</b> <i>$val</i> (Weight <i>$key</i>)<br>";
?>
</ul>
PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing
(Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch).
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