DNS::delZone PHP Method

    function delZone($domain)
    {
        if ($this->isDomain($domain)) {
            $domainid = $this->db->quote($this->domainId($domain));
            $this->db->Execute("DELETE FROM records_a WHERE domainid = {$domainid}");
            $this->db->Execute("DELETE FROM records_cname WHERE domainid = {$domainid}");
            $this->db->Execute("DELETE FROM records_mx WHERE domainid = {$domainid}");
            $this->db->Execute("DELETE FROM domains WHERE domainid = {$domainid}");
            $letter = substr($domain, 0, 1);
            $zonefile = $this->path . "/{$letter}/" . $domain;
            if (file_exists($zonefile)) {
                unlink($zonefile);
            }
            $this->writeConf();
            $this->reloadZone();
        }
    }