An example of how to get MX records for a domain.

get_mx_records.php

<?php

$records = dns_get_record("abc.xyz", DNS_MX);

foreach ($records as $rec) {
	print($rec['host']."\n");
	print($rec['type']."\n");
	print($rec['pri']."\n");
	print($rec['target']."\n");
	print($rec['class']."\n");
	print($rec['ttl']."\n");
}
?>