/**
 * This function returns a instance (and creates a new one
 * if there isnt already one) of a class.
 * 
 * @author Johannes Klose <[email protected]>
 * @param  string $class Class from where an instance should be returned.
 * @return object        Instance of $class
 **/
function &singleton($class)
{
    static $singleton;
    if (!is_object($singleton)) {
        $singleton = new singleton();
    }
    return $singleton->instance($class);
}

 public static function getInstance(&$sql, $location, $var, $type)
 {
     // 确定类型
     switch ($type) {
         default:
             // 默认使用字符串类型
         // 默认使用字符串类型
         case 'STRING':
             $var = addslashes($var);
             // 转义
             $var = "'" . $var . "'";
             // 加上单引号.sql语句中字符串插入必须加单引号
             break;
         case 'INTEGER':
         case 'INT':
             $var = (int) $var;
             // 强制转换成int
             // 还可以增加更多的类型...
     }
     $pos = 0;
     // 判断该类是否是第一次被实例化
     if (self::$instance == NULL) {
         self::$instance = new singleton();
         for ($i = 1; $i <= $location; $i++) {
             $pos = strpos($sql, '?', $pos + 1);
         }
     } else {
         for ($i = 1; $i <= $location - 1; $i++) {
             $pos = strpos($sql, '?', $pos + 1);
         }
     }
     return $sql = substr($sql, 0, $pos) . $var . substr($sql, $pos + 1);
 }

 public static function get_instance($text)
 {
     if (!isset(singleton::$singleton)) {
         singleton::$singleton = new singleton($text);
     }
     return singleton::$singleton;
 }

 public static function getInstance()
 {
     if (self::$instance == null) {
         self::$instance = new singleton();
     }
     return self::$instance;
 }

 public function update_check()
 {
     $config =& singleton::get(__NAMESPACE__ . '\\config');
     $apptrack =& singleton::get(__NAMESPACE__ . '\\apptrack');
     $send_data['application_id'] = 1;
     $send_data['version'] = $config->get('program_version');
     $data = $apptrack->send($send_data);
     if (!empty($data)) {
         $config->set('last_update_response', $data);
         return true;
     } else {
         $log =& singleton::get(__NAMESPACE__ . '\\log');
         $log_array['event_severity'] = 'warning';
         $log_array['event_number'] = E_USER_WARNING;
         $log_array['event_description'] = 'Unable to contact update server.';
         $log_array['event_file'] = __FILE__;
         $log_array['event_file_line'] = __LINE__;
         $log_array['event_type'] = 'update_check';
         $log_array['event_source'] = 'cron';
         $log_array['event_version'] = '1';
         $log_array['log_backtrace'] = false;
         $log->add($log_array);
         return false;
     }
 }

 public function get($name)
 {
     $error =& singleton::get(__NAMESPACE__ . '\\error');
     if (isset($this->language_array[$name])) {
         //return '試験';
         //return '試験' . $this->language_array[$name];
         return $this->language_array[$name];
     } else {
         //$error->create(array('type' => 'language_item_missing', 'message' => 'Unable to find language item "'.$name.'".'));
         return $name;
     }
 }

 public function optimise_tables()
 {
     global $db;
     $tables =& singleton::get(__NAMESPACE__ . '\\tables');
     $log =& singleton::get(__NAMESPACE__ . '\\log');
     $log_array['event_severity'] = 'notice';
     $log_array['event_number'] = E_USER_NOTICE;
     $log_array['event_description'] = 'Optimising Tables';
     $log_array['event_file'] = __FILE__;
     $log_array['event_file_line'] = __LINE__;
     $log_array['event_type'] = 'optimise_tables';
     $log_array['event_source'] = 'db_maintenance';
     $log_array['event_version'] = '1';
     $log_array['log_backtrace'] = false;
     $log->add($log_array);
     $optimise_tables = '';
     foreach ($tables->get() as $value => $index) {
         $optimise_tables .= $index . ',';
     }
     $optimise_tables = substr($optimise_tables, 0, strlen($optimise_tables) - 1);
     $query = 'OPTIMIZE TABLE ' . $optimise_tables;
     foreach ($db->query($query, database::FETCH_ASSOC) as $row) {
         if ($row['Msg_type'] == 'error') {
             $number = E_USER_WARNING;
             $type = 'warning';
         } else {
             $number = E_USER_NOTICE;
             $type = 'notice';
         }
         $log_array['event_severity'] = $type;
         $log_array['event_number'] = $number;
         $log_array['event_description'] = 'Table "' . $row['Table'] . '"<br />Message "' . $row['Msg_text'] . '"';
         $log_array['event_file'] = __FILE__;
         $log_array['event_file_line'] = __LINE__;
         $log_array['event_type'] = 'optimise_tables';
         $log_array['event_source'] = 'db_maintenance';
         $log_array['event_version'] = '1';
         $log_array['log_backtrace'] = false;
         $log->add($log_array);
     }
     $log_array['event_severity'] = 'notice';
     $log_array['event_number'] = E_USER_NOTICE;
     $log_array['event_description'] = 'Optimising Tables Complete';
     $log_array['event_file'] = __FILE__;
     $log_array['event_file_line'] = __LINE__;
     $log_array['event_type'] = 'optimise_tables';
     $log_array['event_source'] = 'db_maintenance';
     $log_array['event_version'] = '1';
     $log_array['log_backtrace'] = false;
     $log->add($log_array);
 }

 public function send($array)
 {
     $log =& singleton::get(__NAMESPACE__ . '\\log');
     $array['token'] = $this->app_key;
     /*
     	Limit to 512 chars as per pushover limit.
     */
     $remove = 0;
     if (isset($array['title'])) {
         $remove = (int) strlen($array['title']);
     }
     if (isset($array['message'])) {
         $array['message'] = substr($array['message'], 0, 512 - $remove);
     }
     $options = array('http' => array('user_agent' => user_agent(), 'timeout' => 5, 'method' => 'POST', 'header' => 'Content-type: application/x-www-form-urlencoded', 'content' => http_build_query($array)));
     $context = stream_context_create($options);
     $result = @file_get_contents($this->api_url, false, $context);
     if ($result) {
         $return_data = json_decode($result, true);
         if ($return_data['status'] == 1) {
             return true;
         } else {
             $larray['event_severity'] = 'error';
             $larray['event_number'] = E_USER_ERROR;
             $larray['event_description'] = 'Unable to send pushover message.';
             $larray['event_file'] = __FILE__;
             $larray['event_file_line'] = __LINE__;
             $larray['event_type'] = 'send';
             $larray['event_source'] = 'pushover';
             $larray['event_version'] = '1';
             $larray['log_backtrace'] = true;
             $log->add($larray);
         }
     } else {
         $larray['event_severity'] = 'error';
         $larray['event_number'] = E_USER_ERROR;
         $larray['event_description'] = 'Unable to send pushover message.';
         $larray['event_file'] = __FILE__;
         $larray['event_file_line'] = __LINE__;
         $larray['event_type'] = 'send';
         $larray['event_source'] = 'pushover';
         $larray['event_version'] = '1';
         $larray['log_backtrace'] = true;
         $log->add($larray);
     }
     return false;
 }

 /**
  * validateAddPortfolio
  *
  * Validate new portfolio
  * @param($_POST)
  * @return(boolean)
  */
 public function validateAddPortfolio()
 {
     # get the modal
     $oPortfolio = singleton::getInstance('Portfolio');
     # the slug
     $page_slug = $_POST['page_slug'];
     # create empty error
     $aErrors = array();
     if (strlen($_POST['portfolio_title']) >= 30) {
         $aErrors['title'] = true;
     }
     if (strlen($_POST['portfolio_description']) >= 1000) {
         $aErrors['description'] = true;
     }
     if (strlen($_POST['portfolio_github_link']) >= 100) {
         $aErrors['github'] = true;
     }
     if (strlen($_POST['portfolio_website_link']) >= 100) {
         $aErrors['portfolio_website_link'] = true;
     }
     if (strlen($_POST['portfolio_meta_title']) >= 100) {
         $aErrors['portfolio_meta_title'] = true;
     }
     if (strlen($_POST['portfolio_meta_keyword']) >= 1000) {
         $aErrors['portfolio_meta_title'] = true;
     }
     if (strlen($_POST['portfolio_meta_desc']) >= 2) {
         $aErrors['portfolio_meta_desc'] = true;
     }
     if (strlen($page_slug) >= 25) {
         $aErrors['page_slug_too_long'] = true;
     }
     # check regex
     if (!preg_match('/^[a-z0-9-]+$/', $page_slug)) {
         $aErrors['not_a_valid_regex'] = true;
     }
     # check if availble
     if (!$oPortfolio->checkSlugAvailable($page_slug)) {
         $aErrors['slug_not_available'] = true;
     }
     if ($aErrors) {
         return var_dump($aErrors);
     } else {
         return true;
     }
 }

 private function can_view($array)
 {
     $auth =& singleton::get(__NAMESPACE__ . '\\auth');
     $tickets =& singleton::get(__NAMESPACE__ . '\\tickets');
     $user_level = (int) $auth->get('user_level');
     switch ($user_level) {
         case 6:
             //admin
             break;
         case 5:
             //moderator
             $get_array['department_or_assigned_or_user_id'] = $auth->get('id');
             break;
         case 4:
             //staff member
             $get_array['department_or_assigned_or_user_id'] = $auth->get('id');
             break;
         case 3:
             //user
             $get_array['assigned_or_user_id'] = $auth->get('id');
             break;
         case 2:
             //global moderator
             break;
         default:
             //sub
             $get_array['user_id'] = $auth->get('id');
             break;
     }
     $get_array['count'] = true;
     $get_array['id'] = (int) $array['id'];
     $result = $tickets->get($get_array);
     if (!empty($result) && $result[0]['count'] != 0) {
         return true;
     } else {
         return false;
     }
 }

 function display()
 {
     $config =& singleton::get(__NAMESPACE__ . '\\config');
     $language =& singleton::get(__NAMESPACE__ . '\\language');
     header("Content-type: image/png");
     if (isset($this->text) && !empty($this->text)) {
         $capture_text = $this->text;
     } else {
         $capture_text = $language->get('Error');
     }
     $string = strtoupper($capture_text);
     $r = rand(0, 150);
     $g = rand(0, 150);
     $b = rand(0, 150);
     $im = imagecreatefrompng(THEMES . '/' . CURRENT_THEME . '/images/captcha_background.png');
     $colour = imagecolorallocate($im, $r, $g, $b);
     $size = rand(20, 25);
     $angle = rand(0, 3);
     $left = rand(5, 17);
     $bottomleft = 38;
     imagettftext($im, $size, $angle, $left, $bottomleft, $colour, SYSTEM . "/fonts/delicious.otf", $string);
     imagepng($im);
     imagedestroy($im);
 }

/**
 * Returns an HTML string while stripping out bad HTML
 *
 * @param   string   	$string 		The HTML to make safe
 * @return  string						The safe HTML
 */
function html_output($string)
{
    $purifier =& singleton::get('HTMLPurifier');
    return $purifier->purify($string);
}

 function get($array = NULL)
 {
     global $db;
     $tables =& singleton::get(__NAMESPACE__ . '\\tables');
     $error =& singleton::get(__NAMESPACE__ . '\\error');
     $site_id = SITE_ID;
     $query = "SELECT mn.*, {$tables->users}.name, {$tables->users}.email FROM {$tables->message_notes} mn, {$tables->users} WHERE mn.site_id = :site_id";
     if (isset($array['id'])) {
         $query .= " AND mn.id = :id";
     }
     if (isset($array['user_id'])) {
         $query .= " AND mn.user_id = :user_id";
     }
     if (isset($array['message_id'])) {
         $query .= " AND mn.message_id = :message_id";
     }
     $query .= " AND {$tables->users}.id = mn.user_id";
     $query .= " ORDER BY mn.id";
     try {
         $stmt = $db->prepare($query);
     } catch (\PDOException $e) {
         $error->create(array('type' => 'sql_prepare_error', 'message' => $e->getMessage()));
     }
     $stmt->bindParam(':site_id', $site_id, database::PARAM_INT);
     if (isset($array['id'])) {
         $stmt->bindParam(':id', $array['id'], database::PARAM_INT);
     }
     if (isset($array['user_id'])) {
         $stmt->bindParam(':user_id', $array['user_id'], database::PARAM_INT);
     }
     if (isset($array['message_id'])) {
         $stmt->bindParam(':message_id', $array['message_id'], database::PARAM_INT);
     }
     try {
         $stmt->execute();
     } catch (\PDOException $e) {
         $error->create(array('type' => 'sql_execute_error', 'message' => $e->getMessage()));
     }
     $items = $stmt->fetchAll(database::FETCH_ASSOC);
     return $items;
 }

 function delete_group($array = NULL)
 {
     global $db;
     if (!isset($array['id'])) {
         return false;
     }
     $error =& singleton::get(__NAMESPACE__ . '\\error');
     $log =& singleton::get(__NAMESPACE__ . '\\log');
     $tables =& singleton::get(__NAMESPACE__ . '\\tables');
     $auth =& singleton::get(__NAMESPACE__ . '\\auth');
     $config =& singleton::get(__NAMESPACE__ . '\\config');
     $site_id = SITE_ID;
     $query = "DELETE FROM {$tables->ticket_field_values} WHERE site_id = :site_id";
     if (isset($array['id'])) {
         $query .= " AND ticket_field_group_id = :id";
     }
     try {
         $stmt = $db->prepare($query);
     } catch (\Exception $e) {
         $error->create(array('type' => 'sql_prepare_error', 'message' => $e->getMessage()));
     }
     $stmt->bindParam(':site_id', $site_id, database::PARAM_INT);
     if (isset($array['id'])) {
         $stmt->bindParam(':id', $array['id'], database::PARAM_INT);
     }
     try {
         $stmt->execute();
     } catch (\Exception $e) {
         $error->create(array('type' => 'sql_execute_error', 'message' => $e->getMessage()));
     }
     $query = "DELETE FROM {$tables->ticket_fields} WHERE site_id = :site_id";
     if (isset($array['id'])) {
         $query .= " AND ticket_field_group_id = :id";
     }
     try {
         $stmt = $db->prepare($query);
     } catch (\Exception $e) {
         $error->create(array('type' => 'sql_prepare_error', 'message' => $e->getMessage()));
     }
     $stmt->bindParam(':site_id', $site_id, database::PARAM_INT);
     if (isset($array['id'])) {
         $stmt->bindParam(':id', $array['id'], database::PARAM_INT);
     }
     try {
         $stmt->execute();
     } catch (\Exception $e) {
         $error->create(array('type' => 'sql_execute_error', 'message' => $e->getMessage()));
     }
     $query = "DELETE FROM {$tables->ticket_field_group} WHERE site_id = :site_id";
     if (isset($array['id'])) {
         $query .= " AND id = :id";
     }
     try {
         $stmt = $db->prepare($query);
     } catch (\Exception $e) {
         $error->create(array('type' => 'sql_prepare_error', 'message' => $e->getMessage()));
     }
     $stmt->bindParam(':site_id', $site_id, database::PARAM_INT);
     if (isset($array['id'])) {
         $stmt->bindParam(':id', $array['id'], database::PARAM_INT);
     }
     try {
         $stmt->execute();
     } catch (\Exception $e) {
         $error->create(array('type' => 'sql_execute_error', 'message' => $e->getMessage()));
     }
 }

 /**
  * Logs out the current user.
  */
 public function logout()
 {
     $plugins =& singleton::get(__NAMESPACE__ . '\\plugins');
     $plugins->run('auth_logout_start');
     unset($this->current_user);
     session_destroy();
 }

 function disable($plugin_name)
 {
     $config =& singleton::get(__NAMESPACE__ . '\\config');
     $log =& singleton::get(__NAMESPACE__ . '\\log');
     if (in_array($plugin_name, $this->installed_plugins)) {
         $key = array_search($plugin_name, $this->installed_plugins);
         unset($this->installed_plugins[$key]);
         $this->installed_plugins = array_values($this->installed_plugins);
         $log_array['event_severity'] = 'notice';
         $log_array['event_number'] = E_USER_NOTICE;
         $log_array['event_description'] = 'Plugin Disabled "' . $plugin_name . '"';
         $log_array['event_file'] = __FILE__;
         $log_array['event_file_line'] = __LINE__;
         $log_array['event_type'] = 'disable';
         $log_array['event_source'] = 'plugins';
         $log_array['event_version'] = '1';
         $log_array['log_backtrace'] = false;
         $log->add($log_array);
         $config->set('plugin_data', $this->installed_plugins);
     }
 }

Sedan2::what_vehicle();
class singleton
{
    public static $instance;
    private function __construct()
    {
        echo 'Contruct of singleton class called' . "\n";
    }
    public static function get_instance()
    {
        if (!static::$instance instanceof static) {
            static::$instance = new static();
        }
        return static::$instance;
    }
    public function test()
    {
        echo 'test function called' . "\n";
    }
}
class B extends singleton
{
    public static $instance;
    protected function __construct()
    {
        echo 'Construct of Class B called' . "\n";
    }
}
singleton::get_instance()->test();
B::get_instance()->test();
B::get_instance()->test();

 function delete($array = NULL)
 {
     global $db;
     $tables =& singleton::get(__NAMESPACE__ . '\\tables');
     $error =& singleton::get(__NAMESPACE__ . '\\error');
     $log =& singleton::get(__NAMESPACE__ . '\\log');
     $site_id = SITE_ID;
     //delete user permissions
     if (isset($array['id'])) {
         $query = "DELETE FROM {$tables->users_to_departments} WHERE site_id = :site_id AND department_id = :department_id";
         try {
             $stmt = $db->prepare($query);
         } catch (\PDOException $e) {
             $error->create(array('type' => 'sql_prepare_error', 'message' => $e->getMessage()));
         }
         $stmt->bindParam(':site_id', $site_id, database::PARAM_INT);
         $stmt->bindParam(':department_id', $array['id'], database::PARAM_INT);
         try {
             $stmt->execute();
         } catch (\PDOException $e) {
             $error->create(array('type' => 'sql_execute_error', 'message' => $e->getMessage()));
         }
     }
     //delete ticket departments
     $query = "DELETE FROM {$tables->ticket_departments} WHERE site_id = :site_id";
     if (isset($array['id'])) {
         $query .= " AND id = :id";
     }
     if (isset($array['enabled'])) {
         $query .= " AND enabled = :enabled";
     }
     try {
         $stmt = $db->prepare($query);
     } catch (\PDOException $e) {
         $error->create(array('type' => 'sql_prepare_error', 'message' => $e->getMessage()));
     }
     $stmt->bindParam(':site_id', $site_id, database::PARAM_INT);
     if (isset($array['id'])) {
         $stmt->bindParam(':id', $array['id'], database::PARAM_INT);
     }
     if (isset($array['enabled'])) {
         $stmt->bindParam(':enabled', $array['enabled'], database::PARAM_INT);
     }
     try {
         $stmt->execute();
     } catch (\PDOException $e) {
         $error->create(array('type' => 'sql_execute_error', 'message' => $e->getMessage()));
     }
     $log_array['event_severity'] = 'notice';
     $log_array['event_number'] = E_USER_NOTICE;
     $log_array['event_description'] = 'Ticket Department Deleted ID ' . safe_output($array['id']);
     $log_array['event_file'] = __FILE__;
     $log_array['event_file_line'] = __LINE__;
     $log_array['event_type'] = 'delete';
     $log_array['event_source'] = 'ticket_departments';
     $log_array['event_version'] = '1';
     $log_array['log_backtrace'] = false;
     $log->add($log_array);
 }

 public function send_email($array)
 {
     $config =& singleton::get(__NAMESPACE__ . '\\config');
     $log =& singleton::get(__NAMESPACE__ . '\\log');
     $pop_accounts =& singleton::get(__NAMESPACE__ . '\\pop_accounts');
     $smtp_accounts =& singleton::get(__NAMESPACE__ . '\\smtp_accounts');
     try {
         //clear any current info
         $this->phpmailer->ClearAllRecipients();
         $this->phpmailer->ClearAttachments();
         $this->phpmailer->From = 'do_not_reply@' . $config->get('domain');
         $found_smtp_account = false;
         if (isset($array['pop_account_id']) && !empty($array['pop_account_id'])) {
             $pop_array = $pop_accounts->get(array('id' => $array['pop_account_id'], 'get_other_data' => true));
             if (!empty($pop_array) && !empty($pop_array[0]['smtp_hostname']) && $pop_array[0]['smtp_enabled'] == 1) {
                 $smtp['hostname'] = $pop_array[0]['smtp_hostname'];
                 $smtp['port'] = $pop_array[0]['smtp_port'];
                 $smtp['tls'] = $pop_array[0]['smtp_tls'];
                 $smtp['username'] = $pop_array[0]['smtp_username'];
                 $smtp['password'] = decode($pop_array[0]['smtp_password']);
                 $smtp['authentication'] = $pop_array[0]['smtp_authentication'];
                 $smtp['email_address'] = $pop_array[0]['smtp_email_address'];
                 $found_smtp_account = true;
             }
         } else {
             if (isset($array['smtp_account_id']) && !empty($array['smtp_account_id'])) {
                 $smtp_array = $smtp_accounts->get(array('id' => $array['smtp_account_id']));
                 if (!empty($smtp_array) && !empty($smtp_array[0]['hostname']) && $smtp_array[0]['enabled'] == 1) {
                     $smtp['hostname'] = $smtp_array[0]['hostname'];
                     $smtp['port'] = $smtp_array[0]['port'];
                     $smtp['tls'] = $smtp_array[0]['tls'];
                     $smtp['username'] = $smtp_array[0]['username'];
                     $smtp['password'] = decode($smtp_array[0]['password']);
                     $smtp['authentication'] = $smtp_array[0]['authentication'];
                     $smtp['email_address'] = $smtp_array[0]['email_address'];
                     $found_smtp_account = true;
                 }
             }
         }
         if (!$found_smtp_account) {
             $smtp_array = $smtp_accounts->get(array('id' => $config->get('default_smtp_account')));
             if (!empty($smtp_array) && !empty($smtp_array[0]['hostname']) && $smtp_array[0]['enabled'] == 1) {
                 $smtp['hostname'] = $smtp_array[0]['hostname'];
                 $smtp['port'] = $smtp_array[0]['port'];
                 $smtp['tls'] = $smtp_array[0]['tls'];
                 $smtp['username'] = $smtp_array[0]['username'];
                 $smtp['password'] = decode($smtp_array[0]['password']);
                 $smtp['authentication'] = $smtp_array[0]['authentication'];
                 $smtp['email_address'] = $smtp_array[0]['email_address'];
                 $found_smtp_account = true;
             }
         }
         if ($found_smtp_account) {
             //what server to send the email to
             $this->phpmailer->Host = $smtp['hostname'];
             $this->phpmailer->Mailer = 'smtp';
             //setup authentication if required
             if ($smtp['authentication']) {
                 $this->phpmailer->SMTPAuth = true;
                 // turn on SMTP authentication
                 $this->phpmailer->Username = $smtp['username'];
                 $this->phpmailer->Password = $smtp['password'];
             }
             if ($smtp['tls']) {
                 $this->phpmailer->SMTPSecure = 'tls';
             }
             $this->phpmailer->Port = (int) $smtp['port'];
             //setup the basic email stuff
             if (isset($array['from'])) {
                 $this->phpmailer->From = $array['from'];
             } else {
                 if (!empty($smtp['email_address'])) {
                     $this->phpmailer->From = $smtp['email_address'];
                 }
             }
         } else {
             $this->phpmailer->Mailer = 'mail';
             if (isset($array['from'])) {
                 $this->phpmailer->From = $array['from'];
             }
         }
         //increase the default timeout to 15 seconds
         $this->phpmailer->Timeout = 15;
         $this->phpmailer->CharSet = 'utf-8';
         if (isset($array['html']) && $array['html'] == true) {
             $this->phpmailer->IsHTML(true);
         }
         if (isset($array['from_name'])) {
             $this->phpmailer->FromName = $array['from_name'];
         } else {
             $this->phpmailer->FromName = $config->get('name');
         }
         $this->phpmailer->Subject = $array['subject'];
         $this->phpmailer->Body = $array['body'];
         if (isset($array['to']) && is_array($array['to'])) {
             if (!empty($array['to']['to'])) {
                 $this->phpmailer->AddAddress($array['to']['to'], $array['to']['to_name']);
             }
         }
         //add multiple files
//.........这里部分代码省略.........

//message_notes
$ticket_custom_fields =& singleton::get(__NAMESPACE__ . '\\ticket_custom_fields');
//pushover
$pushover =& singleton::get(__NAMESPACE__ . '\\pushover');
//users_to_departments
$users_to_departments =& singleton::get(__NAMESPACE__ . '\\users_to_departments');
//db_maintenance
$db_maintenance =& singleton::get(__NAMESPACE__ . '\\db_maintenance');
require FUNCTIONS . '/default_tasks.php';
/**
 *
 * URL Handling Code. Everything is redirected with the .htaccess file to index.php?url=
 *
 */
if (isset($_GET['url'])) {
    $input_url = $_GET['url'];
} else {
    $input_url = '';
}
$url =& singleton::get(__NAMESPACE__ . '\\url', array('url' => $input_url));
unset($input_url);
$auth->load();
//html purifier
include LIB . '/htmlpurifier/HTMLPurifier.auto.php';
$htmlpurifier_config = \HTMLPurifier_Config::createDefault();
//default html is set to XHTML 1.1
//$htmlpurifier_config->set('Core.Encoding', 'XHTML 1.1');
//create the class we are going to use.
$purifier =& singleton::get('HTMLPurifier', $htmlpurifier_config);
$plugins->load();
$plugins->run('loader');