function qa_install_db_fail_handler($type, $errno = null, $error = null, $query = null)
 {
     global $pass_failure_from_install;
     $pass_failure_type = $type;
     $pass_failure_errno = $errno;
     $pass_failure_error = $error;
     $pass_failure_query = $query;
     $pass_failure_from_install = true;
     require QA_INCLUDE_DIR . 'qa-install.php';
     qa_exit('error');
 }

function qa_page_db_fail_handler($type, $errno = null, $error = null, $query = null)
{
    if (qa_to_override(__FUNCTION__)) {
        $args = func_get_args();
        return qa_call_override(__FUNCTION__, $args);
    }
    $pass_failure_type = $type;
    $pass_failure_errno = $errno;
    $pass_failure_error = $error;
    $pass_failure_query = $query;
    require_once QA_INCLUDE_DIR . 'qa-install.php';
    qa_exit('error');
}

function qa_feed_not_found()
{
    header('HTTP/1.0 404 Not Found');
    echo qa_lang_html('misc/feed_not_found');
    qa_exit();
}

function qa_image_db_fail_handler()
{
    header('HTTP/1.1 500 Internal Server Error');
    qa_exit('error');
}

function qa_redirect_raw($url)
{
    if (qa_to_override(__FUNCTION__)) {
        $args = func_get_args();
        return qa_call_override(__FUNCTION__, $args);
    }
    header('Location: ' . $url);
    qa_exit('redirect');
}

        $qa_content['script_onloads'][] = array("qa_mailing_start('mailing_ok', 'domailingpause');");
    } else {
        // rudimentary non-Javascript version of mass mailing loop
        echo '<tt>';
        while (true) {
            qa_mailing_perform_step();
            $message = qa_mailing_progress_message();
            if (!isset($message)) {
                break;
            }
            echo qa_html($message) . str_repeat('    ', 1024) . "<br>\n";
            flush();
            sleep(1);
        }
        echo qa_lang_html('admin/mailing_complete') . '</tt><p><a href="' . qa_path_html('admin/mailing') . '">' . qa_lang_html('admin/admin_title') . ' - ' . qa_lang_html('admin/mailing_title') . '</a>';
        qa_exit();
    }
}
function qa_optionfield_make_select(&$optionfield, $options, $value, $default)
{
    $optionfield['type'] = 'select';
    $optionfield['options'] = $options;
    $optionfield['value'] = isset($options[qa_html($value)]) ? $options[qa_html($value)] : @$options[$default];
}
$indented = false;
foreach ($showoptions as $optionname) {
    if (empty($optionname)) {
        $indented = false;
        $qa_content['form']['fields'][] = array('type' => 'blank');
    } elseif (strpos($optionname, '/') !== false) {
        $qa_content['form']['fields'][] = array('type' => 'static', 'label' => qa_lang_html($optionname));

function qa_ajax_db_fail_handler()
{
    echo "QA_AJAX_RESPONSE\n0\nA database error occurred.";
    qa_exit('error');
}

/**
 * If a DB error occurs, call the installed fail handler (if any) otherwise report error and exit immediately.
 */
function qa_db_fail_error($type, $errno = null, $error = null, $query = null)
{
    if (qa_to_override(__FUNCTION__)) {
        $args = func_get_args();
        return qa_call_override(__FUNCTION__, $args);
    }
    global $qa_db_fail_handler;
    @error_log('PHP Question2Answer MySQL ' . $type . ' error ' . $errno . ': ' . $error . (isset($query) ? ' - Query: ' . $query : ''));
    if (function_exists($qa_db_fail_handler)) {
        $qa_db_fail_handler($type, $errno, $error, $query);
    } else {
        echo '<hr><font color="red">Database ' . htmlspecialchars($type . ' error ' . $errno) . '<p>' . nl2br(htmlspecialchars($error . "\n\n" . $query));
        qa_exit('error');
    }
}