PMA\libraries\Message::sanitize PHP Method

    public static function sanitize($message)
    {
        if (is_array($message)) {
            foreach ($message as $key => $val) {
                $message[$key] = Message::sanitize($val);
            }
            return $message;
        }
        return htmlspecialchars($message);
    }

/**
 * get the warning messages array
 *
 * @return array  $warning_essages
 */
function PMA_getWarningMessages()
{
    $warning_essages = array();
    foreach ($GLOBALS['dbi']->getWarnings() as $warning) {
        $warning_essages[] = Message::sanitize($warning['Level'] . ': #' . $warning['Code'] . ' ' . $warning['Message']);
    }
    return $warning_essages;
}