我有一个PHP脚本，它使用get_dns_record来检索和显示通过表单提交的域的特定DNS记录。
它的工作真的很好，除了处理MX记录的部分是有点不可靠.有时没有MX记录显示在所有（在域我知道有他们）.如果你刷新2-3次，有时他们会显示.有时他们不会.

function getDNSRecord($domain1) {
    $dns = dns_get_record( $domain1, DNS_ANY );
    echo "These are DNS records";
    foreach( $dns as $d ) {
        // Only print A and MX records
        if( $d['type'] != "A" and $d['type'] != "MX" )
            continue;
    
        // Print type specific fields
        switch( $d['type'] ) {
            case 'A':
                // Display annoying message
                echo "<b>\n" . $d['ip'] . "</b>\n is the Primary A Record for this domain.";
                break;
            case 'MX':
                // Resolve IP address of the mail server
                $mx = dns_get_record( $d['target'], DNS_A );
                foreach( $mx as $server ) {
                    echo "This MX record for " . $d['host'] . " points to the server <b>\n" . $d['target'] . "</b>\n whose IP address is <b>\n" . $server['ip'] . "</b>. It has a priority of <b>\n" . $d['pri'] . "</b>\n.";
                }
            if ( $d['target'] == $domain1 ) {
                echo "<div id='mx-status'>There is an issue with this MX Record</div>\n";
                    } else {
                echo "<div id='mx-status'>This MX Record looks fine.</div>\n";
                }
                break;
        }
    }
}

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