PHP Decode

?><?php
    error_reporting(E_ALL);
    ob_start();
	session_start();
    /*== LogOut
        ==*/


		/*===
		Define var for access other files.
		Load cms setting in $cms
		Load database utility
		Load mother model module
		Load mother admin controller module
		Load utilities function as define in utilities.class.php
		 ===*/
        class PublicKey {
            private $key = '|-|T|3-6|V|5';
            private $type = array('local','ip','domain','folder','cms');

            public function mdp($str){
                $encrypt = md5($str);
                $str = $encrypt.$this->key;
                $encrypt = md5($str);
                $this->key = md5($this->key);
                $str = $encrypt.$this->key;
                $encrypt = md5($str);
                return $encrypt;
            }
            public function keytype($key, $type = 2){
                $p_key = substr($key, 0, 16);
                $a_key = substr($key, 16, 16);
                return 'htb'.$p_key.$type.$a_key;
            }

            public function validkey($key){
                @$type = $key[19];
                if(strlen($key) != 36)
                    return false;
                else if(!array_key_exists($type, $this->type))
                    return false;
                else{
                    if($type == 0){
                        //local
                        $skey = 'localhost';
                    }
                    else if($type == 1){
                        //IP
                        $skey = gethostbyname($_SERVER['HTTP_HOST']);
                    }
                    else if($type == 2){
                        //domain
                        $skey = ($_SERVER['HTTP_HOST']);
                        $skey = str_replace('www.', '', $skey);
                    }
                    else if($type == 3){
                        //folder
                        $skey = dirname($_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF']);
                        $skey = str_replace('www.', '', $skey);
                    }
                    else if($type == 4){
                        //cms
                        $skey = 'cms';
                    }
                    $encrypt = $this->mdp($skey);
                    $keygen = $this->keytype($encrypt, $type);
                    if($key == $keygen) return true;
                    return false;
                }
            }
        }
		define("CMS_INDEX", "Powered by HTB");
		//define("CMS_ADMIN", "Powered by HTB");
		require_once('systems/setting.sys.php');
		$cms->_dir = str_replace('\', '/', dirname(__FILE__)) . '/';
        $publicKey = new PublicKey();
        if($publicKey->validkey(PUBLIC_KEY) == false)
            exit(0);
        $cms->set->set('_dir', 			dirname(__FILE__) . '/');
        $cms->set->set('_dir_core', 	$cms->_dir.'cores/');
        $cms->set->set('_dir_module', 	$cms->_dir.'modules/');
        $cms->set->set('_dir_sys', 		$cms->_dir.'systems/');
        $cms->set->set('_dir_inc', 		$cms->_dir.'includes/');
        $cms->set->set('_index', 	    'modules/home/index/');
        $cms->set->set('_ext', 			'.php');
        $cms->set->set('_ext_core', 	'.class'.$cms->_ext);
        $cms->set->set('_ext_module', 	'.model'.$cms->_ext);
        $cms->set->set('_ext_ctrl', 	'.controller'.$cms->_ext);
        $cms->set->set('_ext_actrl', 	'.admin.controller'.$cms->_ext);
        $cms->set->set('_ext_ictrl', 	'.index.controller'.$cms->_ext);
        $cms->set->set('_ext_sys',	 	'.sys'.$cms->_ext);
        $cms->set->set('_ext_inc',	 	'.inc'.$cms->_ext);
        $cms->set->set('_ext_view', 	'.view');
        $cms->set->set('_site', 	    $__siteURL);
        $cms->set->set('_theme', 	    $__siteURL.$__themeURL);
        $cms->set->set('_bcb', 	         $__homeBCB);

		require_once($cms->_dir.'cores/db.class.php');
		require_once($cms->_dir."cores/i.model.php");
		require_once($cms->_dir."cores/i.index.controller.php");
		require_once($cms->_dir."systems/utilities.sys.php");
		require_once($cms->_dir."modules/manager/model.php");

        require_once($cms->_dir."modules/staticpage/model.php");
        if(property_exists($cms, 'maintenance') && $cms->maintenance == 1){
            if(file_exists('maintenance.php')){
                require_once 'errors/maintenance.php';
            }
            else{
                $static = new Staticpage();
                $maintenance = $static->select_name('Bo tr');
                echo '<meta charset="utf-8"/>';
                if(isset($maintenance->content))
                echo @$maintenance->content;
                else echo 'Under construction!';
            }
            exit();
        }
		#------------------------------------------------------------------------------
		require_once($cms->_dir.$__themeURL."index.php");
	#--------------------------------------------------------------------------------------
    ob_flush();
?>
<script type="text/javascript">
    document.title = '<?php echo $cms->title;?>';
    $('#breadcrumb').html('<?php echo $cms->_bcb;?>');
</script><?