สอบถามการ แก้ไข Code ใน Joomla ครับ จะเป็นในส่วนของระบบLogin

<?php
	// gcms5/modules/member/login.php
	if (defined('MAIN_INIT')) {
		$login_remember = intval(isset($_POST['login_remember']) ? $_POST['login_remember'] : $_COOKIE[PREFIX.'_login_remember']);
		if (isset($_REQUEST['login_user']) && isset($_REQUEST['login_password'])) {
			// login
			$login_user = $db->sql_trim_str($_POST['login_user']);
			$login_password = $db->sql_trim_str($_POST['login_password']);
			// ตรวจสอบการกรอก
			if ($login_user == '') {
				$error = $lng['LNG_USERNAME_EMPTY'];
				$input = 'login_user';
			} elseif ($login_password == '') {
				$error = $lng['LNG_PASSWORD_EMPTY'];
				$input = 'login_password';
			}
		} elseif ($_REQUEST['action'] == 'logout') {
			// logout เคลีร์ย cookie, session และ ตัวแปร
			setCookie(PREFIX.'_login_user', '', time(), '/');
			setCookie(PREFIX.'_login_password', '', time(), '/');
			setCookie(PREFIX.'_login_remember', '', time(), '/');
			$login_user = '';
			$login_password = '';
			$login_remember = 0;
			unset($_SESSION[PREFIX]['login']);
		} elseif (isset($_SESSION[PREFIX]['login'])) {
			// มาจากการ เปิดหน้าเพจปกติ หรือจาก refresh อ่านจาก SESSION
			$login_user = $_SESSION[PREFIX]['login']['username'];
			$login_password = $_SESSION[PREFIX]['login']['password'];
		} else {
			// เข้าระบบครั้งแรก ตรวจสอบ cookie
			$login_user = gcms::decode($_COOKIE[PREFIX.'_login_user']);
			$login_password = gcms::decode($_COOKIE[PREFIX.'_login_password']);
		}
		$isMember = false;
		$isAdmin = false;
		if (gcms::isSpider()) {
			// มาจาก spider
			$login_user = 'spider';
			$login_password = 'spider';
			$login_result['username'] = 'spider';
			$login_result['displayname'] = 'mr. Spider';
			$login_result['status'] = 0;
			$login_result['point'] = 0;
			$login_result['id'] = 0;
			// spider login
			$_SESSION[PREFIX]['login'] = $login_result;
			$isMember = true;
		} elseif ($login_user != '' && $login_password != '') {
			// ตรวจสอบการ login
			$login_result = gcms::CheckLogin($login_user, $login_password);
			if (is_array($login_result)) {
				// login สำเร็จ
				$_SESSION[PREFIX]['login'] = $login_result;
				$_SESSION[PREFIX]['login']['password'] = $login_password;
				// login
				$isMember = true;
				// admin
				$isAdmin = $isMember && gcms::isAdmin();
				// ตรวจสอบการปันทึกการ login
				if ($login_remember) {
					// บันทึก user, password
					setCookie(PREFIX.'_login_user', gcms::encode($login_result['username']), time() + 3600 * 24 * 365, '/');
					setCookie(PREFIX.'_login_password', gcms::encode($login_password), time() + 3600 * 24 * 365, '/');
				}
				setCookie(PREFIX.'_login_remember', $login_remember, time() + 3600 * 24 * 365, '/');
			} else {
				// ข้อความผิดพลาด
				$error = array();
				$error[] = $lng['MEMBER_NOT_FOUND'];
				$error[] = $lng['MEMBER_NO_ACTIVATE'];
				$error[] = $lng['MEMBER_BAN'];
				$error[] = $lng['PASSWORD_INCORRECT'];
				$error[] = $lng['LNG_MEMBER_LOGIN_EXISTS'];
				$input = $login_result == 3 ? 'login_password' : 'login_user';
				$error = strip_tags($error[$login_result]);
				$login_user = '';
				$login_password = '';
			}
		}
		if (MAIN_INIT == 'chklogin') {
			// โหลดภาษา,config,ไฟล์ inint ของโมดูลที่ติดตั้ง
			$dir = ROOT_PATH.'modules/';
			$f = opendir($dir);
			while ($text = readdir($f)) {
				if ($text != '.' && $text != '..' && $text != 'index' && $text != 'member') {
					if (is_file(ROOT_PATH."modules/$text/config.php")) {
						include_once (ROOT_PATH."modules/$text/config.php");
					}
					if (is_file(ROOT_PATH."modules/$text/inint.php")) {
						include_once (ROOT_PATH."modules/$text/inint.php");
					}
				}
			}
			closedir($f);
		}
		if ($login_user == '' || $login_password == '') {
			if ($config['custom_login'] != '' && is_file(ROOT_PATH.$config['custom_login'])) {
				// custom login form
				include_once (ROOT_PATH.$config['custom_login']);
			} else {
				// ฟอร์ม login
				$patt = array('/{(LNG_[A-Z0-9_]+)}/e', '/{WEBTITLE}/', '/{SUBTITLE}/', '/{USERNAME}/', '/{PASSWORD}/', 
					'/{REMEMBER}/', '/{WEBURL}/');
				$replace = array();
				$replace[] = '$lng[$1]';
				$replace[] = $config['web_title'];
				$replace[] = $error == '' ? $config['web_description'] : '<span class=error>'.$error.'</span>';
				$replace[] = $login_user;
				$replace[] = $login_password;
				$replace[] = $login_remember == 1 ? 'checked' : '';
				$replace[] = WEB_URL;
				$content = preg_replace($patt, $replace, gcms::loadfile(ROOT_PATH.SKIN.$config['skin'].'/member/loginfrm.html'));
			}
		} elseif ($config['custom_member'] != '' && is_file(ROOT_PATH.$config['custom_member'])) {
			// custom member form
			include_once (ROOT_PATH.$config['custom_member']);
		} else {
			// กรอบข้อมูลสมาชิก
			$patt = array('/{WEBTITLE}/', '/{SUBTITLE}/', '/{WEBURL}/', '/{DISPLAYNAME}/', '/{ID}/', '/{USERICON}/', 
				'/{POINT}/', '/{STATUS}/', '/{ADMIN}/', '/{(LNG_[A-Z0-9_]+)}/e');
			$replace = array();
			$replace[] = $config['web_title'];
			$replace[] = $error == '' ? $config['web_description'] : '<span class=error>'.$error.'</span>';
			$replace[] = WEB_URL;
			$replace[] = $login_result['displayname'] == '' ? $login_result['username'] : $login_result['displayname'];
			$replace[] = $login_result['id'];
			$replace[] = $login_result['usericon'];
			$replace[] = $login_result['point'];
			$replace[] = $login_result['status'];
			$replace[] = in_array($login_result['status'], $config['admin_access']) ? '' : ' hidden';
			$replace[] = '$lng[$1]';
			$content = preg_replace($patt, $replace, gcms::loadfile(ROOT_PATH.SKIN.$config['skin'].'/member/memberfrm.html'));
		}
	}