PHP session_get_realuser函數代碼示例

 /**
  * Initialise the settings navigation based on the current context
  *
  * This function initialises the settings navigation tree for a given context
  * by calling supporting functions to generate major parts of the tree.
  *
  */
 public function initialise()
 {
     global $DB, $SESSION, $SITE;
     if (during_initial_install()) {
         return false;
     } else {
         if ($this->initialised) {
             return true;
         }
     }
     $this->id = 'settingsnav';
     $this->context = $this->page->context;
     $context = $this->context;
     if ($context->contextlevel == CONTEXT_BLOCK) {
         $this->load_block_settings();
         $context = $context->get_parent_context();
     }
     switch ($context->contextlevel) {
         case CONTEXT_SYSTEM:
             if ($this->page->url->compare(new moodle_url('/admin/settings.php', array('section' => 'frontpagesettings')))) {
                 $this->load_front_page_settings($context->id == $this->context->id);
             }
             break;
         case CONTEXT_COURSECAT:
             $this->load_category_settings();
             break;
         case CONTEXT_COURSE:
             if ($this->page->course->id != $SITE->id) {
                 $this->load_course_settings($context->id == $this->context->id);
             } else {
                 $this->load_front_page_settings($context->id == $this->context->id);
             }
             break;
         case CONTEXT_MODULE:
             $this->load_module_settings();
             $this->load_course_settings();
             break;
         case CONTEXT_USER:
             if ($this->page->course->id != $SITE->id) {
                 $this->load_course_settings();
             }
             break;
     }
     $settings = $this->load_user_settings($this->page->course->id);
     if (isloggedin() && !isguestuser() && (!property_exists($SESSION, 'load_navigation_admin') || $SESSION->load_navigation_admin)) {
         $admin = $this->load_administration_settings();
         $SESSION->load_navigation_admin = $admin->has_children();
     } else {
         $admin = false;
     }
     if ($context->contextlevel == CONTEXT_SYSTEM && $admin) {
         $admin->force_open();
     } else {
         if ($context->contextlevel == CONTEXT_USER && $settings) {
             $settings->force_open();
         }
     }
     // Check if the user is currently logged in as another user
     if (session_is_loggedinas()) {
         // Get the actual user, we need this so we can display an informative return link
         $realuser = session_get_realuser();
         // Add the informative return to original user link
         $url = new moodle_url('/course/loginas.php', array('id' => $this->page->course->id, 'return' => 1, 'sesskey' => sesskey()));
         $this->add(get_string('returntooriginaluser', 'moodle', fullname($realuser, true)), $url, self::TYPE_SETTING, null, null, new pix_icon('t/left', ''));
     }
     // At this point we give any local plugins the ability to extend/tinker with the navigation settings.
     $this->load_local_plugin_settings();
     foreach ($this->children as $key => $node) {
         if ($node->nodetype != self::NODETYPE_BRANCH || $node->children->count() === 0) {
             $node->remove();
         }
     }
     $this->initialised = true;
 }

 /**
  * Return the standard string that says whether you are logged in (and switched
  * roles/logged in as another user).
  *
  * @return string HTML fragment.
  */
 public function login_info()
 {
     global $USER, $CFG, $DB, $SESSION;
     if (during_initial_install()) {
         return '';
     }
     $loginpage = (string) $this->page->url === get_login_url();
     $course = $this->page->course;
     if (session_is_loggedinas()) {
         $realuser = session_get_realuser();
         $fullname = fullname($realuser, true);
         $realuserinfo = " [<a href=\"{$CFG->wwwroot}/course/loginas.php?id={$course->id}&amp;sesskey=" . sesskey() . "\">{$fullname}</a>] ";
     } else {
         $realuserinfo = '';
     }
     $loginurl = get_login_url();
     if (empty($course->id)) {
         // $course->id is not defined during installation
         return '';
     } else {
         if (isloggedin()) {
             $context = get_context_instance(CONTEXT_COURSE, $course->id);
             $fullname = fullname($USER, true);
             // Since Moodle 2.0 this link always goes to the public profile page (not the course profile page)
             $username = "<a href=\"{$CFG->wwwroot}/user/profile.php?id={$USER->id}\">{$fullname}</a>";
             if (is_mnet_remote_user($USER) and $idprovider = $DB->get_record('mnet_host', array('id' => $USER->mnethostid))) {
                 $username .= " from <a href=\"{$idprovider->wwwroot}\">{$idprovider->name}</a>";
             }
             if (isguestuser()) {
                 $loggedinas = $realuserinfo . get_string('loggedinasguest');
                 if (!$loginpage) {
                     $loggedinas .= " (<a href=\"{$loginurl}\">" . get_string('login') . '</a>)';
                 }
             } else {
                 if (is_role_switched($course->id)) {
                     // Has switched roles
                     $rolename = '';
                     if ($role = $DB->get_record('role', array('id' => $USER->access['rsw'][$context->path]))) {
                         $rolename = ': ' . format_string($role->name);
                     }
                     $loggedinas = get_string('loggedinas', 'moodle', $username) . $rolename . " (<a href=\"{$CFG->wwwroot}/course/view.php?id={$course->id}&amp;switchrole=0&amp;sesskey=" . sesskey() . "\">" . get_string('switchrolereturn') . '</a>)';
                 } else {
                     $loggedinas = $realuserinfo . get_string('loggedinas', 'moodle', $username) . ' ' . " (<a href=\"{$CFG->wwwroot}/login/logout.php?sesskey=" . sesskey() . "\">" . get_string('logout') . '</a>)';
                 }
             }
         } else {
             $loggedinas = get_string('loggedinnot', 'moodle');
             if (!$loginpage) {
                 $loggedinas .= " (<a href=\"{$loginurl}\">" . get_string('login') . '</a>)';
             }
         }
     }
     $loggedinas = '<div class="logininfo">' . $loggedinas . '</div>';
     if (isset($SESSION->justloggedin)) {
         unset($SESSION->justloggedin);
         if (!empty($CFG->displayloginfailures)) {
             if (!isguestuser()) {
                 if ($count = count_login_failures($CFG->displayloginfailures, $USER->username, $USER->lastlogin)) {
                     $loggedinas .= '&nbsp;<div class="loginfailures">';
                     if (empty($count->accounts)) {
                         $loggedinas .= get_string('failedloginattempts', '', $count);
                     } else {
                         $loggedinas .= get_string('failedloginattemptsall', '', $count);
                     }
                     if (file_exists("{$CFG->dirroot}/report/log/index.php") and has_capability('report/log:view', get_context_instance(CONTEXT_SYSTEM))) {
                         $loggedinas .= ' (<a href="' . $CFG->wwwroot . '/report/log/index.php' . '?chooselog=1&amp;id=1&amp;modid=site_errors">' . get_string('logs') . '</a>)';
                     }
                     $loggedinas .= '</div>';
                 }
             }
         }
     }
     return $loggedinas;
 }

        }
    }
}
// Apache log integration. In apache conf file one can use ${MOODULEUSER}n in
// LogFormat to get the current logged in username in moodle.
if ($USER && function_exists('apache_note') && !empty($CFG->apacheloguser) && isset($USER->username)) {
    $apachelog_userid = $USER->id;
    $apachelog_username = clean_filename($USER->username);
    $apachelog_name = '';
    if (isset($USER->firstname)) {
        // We can assume both will be set
        // - even if to empty.
        $apachelog_name = clean_filename($USER->firstname . " " . $USER->lastname);
    }
    if (session_is_loggedinas()) {
        $realuser = session_get_realuser();
        $apachelog_username = clean_filename($realuser->username . " as " . $apachelog_username);
        $apachelog_name = clean_filename($realuser->firstname . " " . $realuser->lastname . " as " . $apachelog_name);
        $apachelog_userid = clean_filename($realuser->id . " as " . $apachelog_userid);
    }
    switch ($CFG->apacheloguser) {
        case 3:
            $logname = $apachelog_username;
            break;
        case 2:
            $logname = $apachelog_name;
            break;
        case 1:
        default:
            $logname = $apachelog_userid;
            break;

//.........這裏部分代碼省略.........
        $cmcontext = null;
    }
    // If the site is currently under maintenance, then print a message
    if (!empty($CFG->maintenance_enabled) and !has_capability('moodle/site:config', $sysctx)) {
        if ($preventredirect) {
            throw new require_login_exception('Maintenance in progress');
        }
        print_maintenance_message();
    }
    // make sure the course itself is not hidden
    if ($course->id == SITEID) {
        // frontpage can not be hidden
    } else {
        if (is_role_switched($course->id)) {
            // when switching roles ignore the hidden flag - user had to be in course to do the switch
        } else {
            if (!$course->visible and !has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
                // originally there was also test of parent category visibility,
                // BUT is was very slow in complex queries involving "my courses"
                // now it is also possible to simply hide all courses user is not enrolled in :-)
                if ($preventredirect) {
                    throw new require_login_exception('Course is hidden');
                }
                notice(get_string('coursehidden'), $CFG->wwwroot . '/');
            }
        }
    }
    // is the user enrolled?
    if ($course->id == SITEID) {
        // everybody is enrolled on the frontpage
    } else {
        if (session_is_loggedinas()) {
            // Make sure the REAL person can access this course first
            $realuser = session_get_realuser();
            if (!is_enrolled($coursecontext, $realuser->id, '', true) and !is_viewing($coursecontext, $realuser->id) and !is_siteadmin($realuser->id)) {
                if ($preventredirect) {
                    throw new require_login_exception('Invalid course login-as access');
                }
                echo $OUTPUT->header();
                notice(get_string('studentnotallowed', '', fullname($USER, true)), $CFG->wwwroot . '/');
            }
        }
        // very simple enrolment caching - changes in course setting are not reflected immediately
        if (!isset($USER->enrol)) {
            $USER->enrol = array();
            $USER->enrol['enrolled'] = array();
            $USER->enrol['tempguest'] = array();
        }
        $access = false;
        if (is_viewing($coursecontext, $USER)) {
            // ok, no need to mess with enrol
            $access = true;
        } else {
            if (isset($USER->enrol['enrolled'][$course->id])) {
                if ($USER->enrol['enrolled'][$course->id] == 0) {
                    $access = true;
                } else {
                    if ($USER->enrol['enrolled'][$course->id] > time()) {
                        $access = true;
                    } else {
                        //expired
                        unset($USER->enrol['enrolled'][$course->id]);
                    }
                }
            }
            if (isset($USER->enrol['tempguest'][$course->id])) {

/**
 * Returns text to be displayed to the user which reflects their login status
 *
 * @uses $CFG
 * @uses $USER
 * @param course $course {@link $COURSE} object containing course information
 * @param user $user {@link $USER} object containing user information
 * @return string
 */
function user_login_string($course = NULL, $user = NULL)
{
    global $USER, $CFG, $SITE, $DB;
    if (empty($user) and !empty($USER->id)) {
        $user = $USER;
    }
    if (empty($course)) {
        $course = $SITE;
    }
    if (session_is_loggedinas()) {
        $realuser = session_get_realuser();
        $fullname = fullname($realuser, true);
        $realuserinfo = " [<a {$CFG->frametarget}\n        href=\"{$CFG->wwwroot}/course/loginas.php?id={$course->id}&amp;return=1&amp;sesskey=" . sesskey() . "\">{$fullname}</a>] ";
    } else {
        $realuserinfo = '';
    }
    $loginurl = get_login_url();
    if (empty($course->id)) {
        // $course->id is not defined during installation
        return '';
    } else {
        if (!empty($user->id)) {
            $context = get_context_instance(CONTEXT_COURSE, $course->id);
            $fullname = fullname($user, true);
            $username = "<a {$CFG->frametarget} href=\"{$CFG->wwwroot}/user/view.php?id={$user->id}&amp;course={$course->id}\">{$fullname}</a>";
            if (is_mnet_remote_user($user) and $idprovider = $DB->get_record('mnet_host', array('id' => $user->mnethostid))) {
                $username .= " from <a {$CFG->frametarget} href=\"{$idprovider->wwwroot}\">{$idprovider->name}</a>";
            }
            if (isset($user->username) && $user->username == 'guest') {
                $loggedinas = $realuserinfo . get_string('loggedinasguest') . " (<a {$CFG->frametarget} href=\"{$loginurl}\">" . get_string('login') . '</a>)';
            } else {
                if (!empty($user->access['rsw'][$context->path])) {
                    $rolename = '';
                    if ($role = $DB->get_record('role', array('id' => $user->access['rsw'][$context->path]))) {
                        $rolename = ': ' . format_string($role->name);
                    }
                    $loggedinas = get_string('loggedinas', 'moodle', $username) . $rolename . " (<a {$CFG->frametarget}\n                      href=\"{$CFG->wwwroot}/course/view.php?id={$course->id}&amp;switchrole=0&amp;sesskey=" . sesskey() . "\">" . get_string('switchrolereturn') . '</a>)';
                } else {
                    $loggedinas = $realuserinfo . get_string('loggedinas', 'moodle', $username) . ' ' . " (<a {$CFG->frametarget} href=\"{$CFG->wwwroot}/login/logout.php?sesskey=" . sesskey() . "\">" . get_string('logout') . '</a>)';
                }
            }
        } else {
            $loggedinas = get_string('loggedinnot', 'moodle') . " (<a {$CFG->frametarget} href=\"{$loginurl}\">" . get_string('login') . '</a>)';
        }
    }
    return '<div class="logininfo">' . $loggedinas . '</div>';
}

//.........這裏部分代碼省略.........
        if ($preventredirect) {
            throw new require_login_exception('Maintenance in progress');
        }
        print_maintenance_message();
    }
    // make sure the course itself is not hidden
    if ($course->id == SITEID) {
        // frontpage can not be hidden
    } else {
        if (is_role_switched($course->id)) {
            // when switching roles ignore the hidden flag - user had to be in course to do the switch
        } else {
            if (!$course->visible and !has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
                // originally there was also test of parent category visibility,
                // BUT is was very slow in complex queries involving "my courses"
                // now it is also possible to simply hide all courses user is not enrolled in :-)
                if ($preventredirect) {
                    throw new require_login_exception('Course is hidden');
                }
                // We need to override the navigation URL as the course won't have
                // been added to the navigation and thus the navigation will mess up
                // when trying to find it.
                navigation_node::override_active_url(new moodle_url('/'));
                notice(get_string('coursehidden'), $CFG->wwwroot . '/');
            }
        }
    }
    // is the user enrolled?
    if ($course->id == SITEID) {
        // everybody is enrolled on the frontpage
    } else {
        if (session_is_loggedinas()) {
            // Make sure the REAL person can access this course first
            $realuser = session_get_realuser();
            if (!is_enrolled($coursecontext, $realuser->id, '', true) and !is_viewing($coursecontext, $realuser->id) and !is_siteadmin($realuser->id)) {
                if ($preventredirect) {
                    throw new require_login_exception('Invalid course login-as access');
                }
                echo $OUTPUT->header();
                notice(get_string('studentnotallowed', '', fullname($USER, true)), $CFG->wwwroot . '/');
            }
        }
        $access = false;
        if (is_role_switched($course->id)) {
            // ok, user had to be inside this course before the switch
            $access = true;
        } else {
            if (is_viewing($coursecontext, $USER)) {
                // ok, no need to mess with enrol
                $access = true;
            } else {
                if (isset($USER->enrol['enrolled'][$course->id])) {
                    if ($USER->enrol['enrolled'][$course->id] > time()) {
                        $access = true;
                        if (isset($USER->enrol['tempguest'][$course->id])) {
                            unset($USER->enrol['tempguest'][$course->id]);
                            remove_temp_course_roles($coursecontext);
                        }
                    } else {
                        //expired
                        unset($USER->enrol['enrolled'][$course->id]);
                    }
                }
                if (isset($USER->enrol['tempguest'][$course->id])) {
                    if ($USER->enrol['tempguest'][$course->id] == 0) {
                        $access = true;

 public function login_info()
 {
     global $USER, $CFG, $DB, $SESSION;
     if (during_initial_install()) {
         return '';
     }
     $course = $this->page->course;
     if (empty($course->id)) {
         // $course->id is not defined during installation
         return '';
     }
     if (session_is_loggedinas()) {
         $real_user = session_get_realuser();
         $real['name'] = fullname($real_user, true);
         $real['link'] = html::url("{$CFG->wwwroot}/course/loginas.php", array('id' => $course->id, 'sesskey' => sesskey()));
     } else {
         $real = null;
     }
     if (!isloggedin()) {
         return bootsnipp::sign_up_sign_in(new moodle_url('/login/index.php'));
     }
     $logout['link'] = html::url("{$CFG->wwwroot}/login/logout.php", array('sesskey' => sesskey()));
     $logout['name'] = get_string('logout');
     $context = get_context_instance(CONTEXT_COURSE, $course->id);
     $user['name'] = fullname($USER, true);
     $user['link'] = html::url("{$CFG->wwwroot}/user/profile.php", array('id' => $USER->id));
     if (is_mnet_remote_user($USER) and $idprovider = $DB->get_record('mnet_host', array('id' => $USER->mnethostid))) {
         $mnet['link'] = $idprovider->wwwroot;
         $mnet['name'] = $idprovider->name;
     } else {
         $mnet = null;
     }
     if (isguestuser()) {
         $guest['link'] = get_login_url();
         $guest['name'] = get_string('login');
         return bootsnipp::guest_user($user['name'], $guest, $logout);
     }
     if (is_role_switched($course->id)) {
         if ($role = $DB->get_record('role', array('id' => $USER->access['rsw'][$context->path]))) {
             $user['name'] .= ': ' . format_string($role->name);
         }
         $role_switch['link'] = "{$CFG->wwwroot}/course/view.php?id={$course->id}&switchrole=0&sesskey=" . sesskey();
         $role_switch['name'] = get_string('switchrolereturn');
     } else {
         $role_switch = null;
     }
     $loginfailures = null;
     if (isset($SESSION->justloggedin)) {
         unset($SESSION->justloggedin);
         if (!empty($CFG->displayloginfailures) && !isguestuser()) {
             if (file_exists("{$CFG->dirroot}/report/log/index.php") and has_capability('report/log:view', get_context_instance(CONTEXT_SYSTEM))) {
                 if ($count = count_login_failures($CFG->displayloginfailures, $USER->username, $USER->lastlogin)) {
                     $loginfailures['link'] = "{$CFG->wwwroot}/report/log/index.php?chooselog=1&id=1&modid=site_errors";
                     if (empty($count->accounts)) {
                         $loginfailures['name'] = get_string('failedloginattempts', '', $count);
                     } else {
                         $loginfailures['name'] = get_string('failedloginattemptsall', '', $count);
                     }
                 }
             }
         }
     }
     return bootsnipp::signed_in($user, $loginfailures, $mnet, $real, $role_switch, $logout);
 }

//.........這裏部分代碼省略.........
        user_accesstime_log($COURSE->id);
        /// Access granted, update lastaccess times
        return;
    } else {
        /// Check if the user can be in a particular course
        if (empty($USER->access['rsw'][$COURSE->context->path])) {
            //
            // MDL-13900 - If the course or the parent category are hidden
            // and the user hasn't the 'course:viewhiddencourses' capability, prevent access
            //
            if (!($COURSE->visible && course_parent_visible($COURSE)) && !has_capability('moodle/course:viewhiddencourses', $COURSE->context)) {
                print_header_simple();
                notice(get_string('coursehidden'), $CFG->wwwroot . '/');
            }
        }
        /// Non-guests who don't currently have access, check if they can be allowed in as a guest
        if ($USER->username != 'guest' and !has_capability('moodle/course:view', $COURSE->context)) {
            if ($COURSE->guest == 1) {
                // Temporarily assign them guest role for this context, if it fails later user is asked to enrol
                $USER->access = load_temp_role($COURSE->context, $CFG->guestroleid, $USER->access);
            }
        }
        /// If the user is a guest then treat them according to the course policy about guests
        if (has_capability('moodle/legacy:guest', $COURSE->context, NULL, false)) {
            if (has_capability('moodle/site:doanything', $sysctx)) {
                // administrators must be able to access any course - even if somebody gives them guest access
                user_accesstime_log($COURSE->id);
                /// Access granted, update lastaccess times
                return;
            }
            switch ($COURSE->guest) {
                /// Check course policy about guest access
                case 1:
                    /// Guests always allowed
                    if (!has_capability('moodle/course:view', $COURSE->context)) {
                        // Prohibited by capability
                        print_header_simple();
                        notice(get_string('guestsnotallowed', '', format_string($COURSE->fullname)), get_login_url());
                    }
                    if (!empty($cm) and !$cm->visible) {
                        // Not allowed to see module, send to course page
                        redirect($CFG->wwwroot . '/course/view.php?id=' . $cm->course, get_string('activityiscurrentlyhidden'));
                    }
                    user_accesstime_log($COURSE->id);
                    /// Access granted, update lastaccess times
                    return;
                    // User is allowed to see this course
                    break;
                case 2:
                    /// Guests allowed with key
                    if (!empty($USER->enrolkey[$COURSE->id])) {
                        // Set by enrol/manual/enrol.php
                        user_accesstime_log($COURSE->id);
                        /// Access granted, update lastaccess times
                        return true;
                    }
                    //  otherwise drop through to logic below (--> enrol.php)
                    break;
                default:
                    /// Guests not allowed
                    $strloggedinasguest = get_string('loggedinasguest');
                    print_header_simple('', '', build_navigation(array(array('name' => $strloggedinasguest, 'link' => null, 'type' => 'misc'))));
                    if (empty($USER->access['rsw'][$COURSE->context->path])) {
                        // Normal guest
                        notice(get_string('guestsnotallowed', '', format_string($COURSE->fullname)), get_login_url());
                    } else {
                        echo $OUTPUT->notification(get_string('guestsnotallowed', '', format_string($COURSE->fullname)));
                        echo '<div class="notifyproblem">' . switchroles_form($COURSE->id) . '</div>';
                        echo $OUTPUT->footer();
                        exit;
                    }
                    break;
            }
            /// For non-guests, check if they have course view access
        } else {
            if (has_capability('moodle/course:view', $COURSE->context)) {
                if (session_is_loggedinas()) {
                    // Make sure the REAL person can also access this course
                    $realuser = session_get_realuser();
                    if (!has_capability('moodle/course:view', $COURSE->context, $realuser->id)) {
                        print_header_simple();
                        notice(get_string('studentnotallowed', '', fullname($USER, true)), $CFG->wwwroot . '/');
                    }
                }
                /// Make sure they can read this activity too, if specified
                if (!empty($cm) && !$cm->visible && !has_capability('moodle/course:viewhiddenactivities', $cm->context)) {
                    redirect($CFG->wwwroot . '/course/view.php?id=' . $cm->course, get_string('activityiscurrentlyhidden'));
                }
                user_accesstime_log($COURSE->id);
                /// Access granted, update lastaccess times
                return;
                // User is allowed to see this course
            }
        }
        /// Currently not enrolled in the course, so see if they want to enrol
        $SESSION->wantsurl = $FULLME;
        redirect($CFG->wwwroot . '/course/enrol.php?id=' . $COURSE->id);
        die;
    }
}

 /**
  * Initialise the settings navigation based on the current context
  *
  * This function initialises the settings navigation tree for a given context
  * by calling supporting functions to generate major parts of the tree.
  *
  */
 public function initialise()
 {
     global $DB;
     if (during_initial_install()) {
         return false;
     } else {
         if ($this->initialised) {
             return true;
         }
     }
     $this->id = 'settingsnav';
     $this->context = $this->page->context;
     $context = $this->context;
     if ($context->contextlevel == CONTEXT_BLOCK) {
         $this->load_block_settings();
         $context = $DB->get_record_sql('SELECT ctx.* FROM {block_instances} bi LEFT JOIN {context} ctx ON ctx.id=bi.parentcontextid WHERE bi.id=?', array($context->instanceid));
     }
     switch ($context->contextlevel) {
         case CONTEXT_SYSTEM:
             if ($this->page->url->compare(new moodle_url('/admin/settings.php', array('section' => 'frontpagesettings')))) {
                 $this->load_front_page_settings($context->id == $this->context->id);
             }
             break;
         case CONTEXT_COURSECAT:
             $this->load_category_settings();
             break;
         case CONTEXT_COURSE:
             if ($this->page->course->id != SITEID) {
                 $this->load_course_settings($context->id == $this->context->id);
             } else {
                 $this->load_front_page_settings($context->id == $this->context->id);
             }
             break;
         case CONTEXT_MODULE:
             $this->load_module_settings();
             $this->load_course_settings();
             break;
         case CONTEXT_USER:
             if ($this->page->course->id != SITEID) {
                 $this->load_course_settings();
             }
             break;
     }
     $settings = $this->load_user_settings($this->page->course->id);
     $admin = $this->load_administration_settings();
     if ($context->contextlevel == CONTEXT_SYSTEM && $admin) {
         $admin->force_open();
     } else {
         if ($context->contextlevel == CONTEXT_USER && $settings) {
             $settings->force_open();
         }
     }
     // Check if the user is currently logged in as another user
     if (session_is_loggedinas()) {
         // Get the actual user, we need this so we can display an informative return link
         $realuser = session_get_realuser();
         // Add the informative return to original user link
         $url = new moodle_url('/course/loginas.php', array('id' => $this->page->course->id, 'return' => 1, 'sesskey' => sesskey()));
         $this->add(get_string('returntooriginaluser', 'moodle', fullname($realuser, true)), $url, self::TYPE_SETTING, null, null, new pix_icon('t/left', ''));
     }
     // Make sure the first child doesnt have proceed with hr set to true
     foreach ($this->children as $key => $node) {
         if ($node->nodetype != self::NODETYPE_BRANCH || $node->children->count() === 0) {
             $node->remove();
         }
     }
     $this->initialised = true;
 }

 /**
  * Return the standard string that says whether you are logged in (and switched
  * roles/logged in as another user).
  * @param bool $withlinks if false, then don't include any links in the HTML produced.
  * If not set, the default is the nologinlinks option from the theme config.php file,
  * and if that is not set, then links are included.
  * @return string HTML fragment.
  */
 public function login_info($withlinks = null)
 {
     global $USER, $CFG, $DB, $SESSION;
     if (during_initial_install()) {
         return '';
     }
     if (is_null($withlinks)) {
         $withlinks = empty($this->page->layout_options['nologinlinks']);
     }
     $loginpage = (string) $this->page->url === get_login_url();
     $course = $this->page->course;
     if (session_is_loggedinas()) {
         $realuser = session_get_realuser();
         $fullname = fullname($realuser, true);
         if ($withlinks) {
             $loginastitle = get_string('loginas');
             $realuserinfo = " [<a href=\"{$CFG->wwwroot}/course/loginas.php?id={$course->id}&amp;sesskey=" . sesskey() . "\"";
             $realuserinfo .= "title =\"" . $loginastitle . "\">{$fullname}</a>] ";
         } else {
             $realuserinfo = " [{$fullname}] ";
         }
     } else {
         $realuserinfo = '';
     }
     $loginurl = get_login_url();
     if (empty($course->id)) {
         // $course->id is not defined during installation
         return '';
     } else {
         if (isloggedin()) {
             $context = context_course::instance($course->id);
             $fullname = fullname($USER, true);
             // Since Moodle 2.0 this link always goes to the public profile page (not the course profile page)
             if ($withlinks) {
                 $linktitle = get_string('viewprofile');
                 $username = "<a href=\"{$CFG->wwwroot}/user/profile.php?id={$USER->id}\" title=\"{$linktitle}\">{$fullname}</a>";
             } else {
                 $username = $fullname;
             }
             if (is_mnet_remote_user($USER) and $idprovider = $DB->get_record('mnet_host', array('id' => $USER->mnethostid))) {
                 if ($withlinks) {
                     $username .= " from <a href=\"{$idprovider->wwwroot}\">{$idprovider->name}</a>";
                 } else {
                     $username .= " from {$idprovider->name}";
                 }
             }
             if (isguestuser()) {
                 $loggedinas = $realuserinfo . get_string('loggedinasguest');
                 if (!$loginpage && $withlinks) {
                     $loggedinas .= " (<a href=\"{$loginurl}\">" . get_string('login') . '</a>)';
                 }
             } else {
                 if (is_role_switched($course->id)) {
                     // Has switched roles
                     $rolename = '';
                     if ($role = $DB->get_record('role', array('id' => $USER->access['rsw'][$context->path]))) {
                         $rolename = ': ' . role_get_name($role, $context);
                     }
                     $loggedinas = get_string('loggedinas', 'moodle', $username) . $rolename;
                     if ($withlinks) {
                         $url = new moodle_url('/course/switchrole.php', array('id' => $course->id, 'sesskey' => sesskey(), 'switchrole' => 0, 'returnurl' => $this->page->url->out_as_local_url(false)));
                         $loggedinas .= ' (' . html_writer::tag('a', get_string('switchrolereturn'), array('href' => $url)) . ')';
                     }
                 } else {
                     $loggedinas = $realuserinfo . get_string('loggedinas', 'moodle', $username);
                     if ($withlinks) {
                         $loggedinas .= " (<a href=\"{$CFG->wwwroot}/login/logout.php?sesskey=" . sesskey() . "\">" . get_string('logout') . '</a>)';
                     }
                 }
             }
         } else {
             $loggedinas = get_string('loggedinnot', 'moodle');
             if (!$loginpage && $withlinks) {
                 $loggedinas .= " (<a href=\"{$loginurl}\">" . get_string('login') . '</a>)';
             }
         }
     }
     $loggedinas = '<div class="logininfo">' . $loggedinas . '</div>';
     if (isset($SESSION->justloggedin)) {
         unset($SESSION->justloggedin);
         if (!empty($CFG->displayloginfailures)) {
             if (!isguestuser()) {
                 if ($count = count_login_failures($CFG->displayloginfailures, $USER->username, $USER->lastlogin)) {
                     $loggedinas .= '&nbsp;<div class="loginfailures">';
                     if (empty($count->accounts)) {
                         $loggedinas .= get_string('failedloginattempts', '', $count);
                     } else {
                         $loggedinas .= get_string('failedloginattemptsall', '', $count);
                     }
                     if (file_exists("{$CFG->dirroot}/report/log/index.php") and has_capability('report/log:view', context_system::instance())) {
                         $loggedinas .= ' (<a href="' . $CFG->wwwroot . '/report/log/index.php' . '?chooselog=1&amp;id=1&amp;modid=site_errors">' . get_string('logs') . '</a>)';
                     }
//.........這裏部分代碼省略.........

    public function login_info($withlinks = null) {
        global $USER, $CFG, $DB, $SESSION,$OUTPUT;

        if (during_initial_install()) {
            return '';
        }

        if (is_null($withlinks)) {
            $withlinks = empty($this->page->layout_options['nologinlinks']);
        }

        $loginpage = ((string)$this->page->url === get_login_url());
        $course = $this->page->course;
        if (\core\session\manager::is_loggedinas()) {
            $realuser = session_get_realuser();
            $fullname = fullname($realuser, true);
            if ($withlinks) {
                $loginastitle = get_string('loginas');
                $realuserinfo = " <a href=\"$CFG->wwwroot/course/loginas.php?id=$course->id&amp;sesskey=".sesskey()."\"";
                $realuserinfo .= "title =\"".$loginastitle."\">$fullname</a>";
            } else {
                $realuserinfo = "$fullname";
            }
        } else {
            $realuserinfo = '';
        }

        $loginurl = get_login_url();

        if (empty($course->id)) {
            // $course->id is not defined during installation
            return '';
        } else if (isloggedin()) {
            $context = context_course::instance($course->id);

            $fullname = fullname($USER, true);
            // Since Moodle 2.0 this link always goes to the public profile page (not the course profile page)
            if ($withlinks) {
                $linktitle = get_string('viewprofile');
                $username = "<a href=\"$CFG->wwwroot/user/view.php?id=$USER->id&course=$course->id\" title=\"$linktitle\">$fullname</a>";
            } else {
                $username = $fullname;
            }
            if (is_mnet_remote_user($USER) and $idprovider = $DB->get_record('mnet_host', array('id'=>$USER->mnethostid))) {
                if ($withlinks) {
                    $username .= " from <a href=\"{$idprovider->wwwroot}\">{$idprovider->name}</a>";
                } else {
                    $username .= " from {$idprovider->name}";
                }
            }
            if (isguestuser()) {
                $loggedinas = get_string('loggedinasguest','theme_colms');
                $loggout = "<a href=\"$CFG->wwwroot/login/logout.php?sesskey=".sesskey()."\" id='logout'>".get_string('logout').'</a>';
                if (!$loginpage && $withlinks) {
                    $loggedinas .= " (<a href=\"$loginurl\" style=\"vertical-align:middle;margin:0;\">".get_string('login').'</a>)';
                }
            } else if (is_role_switched($course->id)) { // Has switched roles
                $rolename = '';
                if ($role = $DB->get_record('role', array('id'=>$USER->access['rsw'][$context->path]))) {
                    // $rolename = ': '.role_get_name($role, $context);
					$rolename = '';
                }
                $loggedinas = get_string('loggedinas', 'theme_colms', $username).$rolename;
                if ($withlinks) {
                    $url = new moodle_url('/course/switchrole.php', array('id'=>$course->id,'sesskey'=>sesskey(), 'switchrole'=>0, 'returnurl'=>$this->page->url->out_as_local_url(false)));
                    // $loggedinas .= '('.html_writer::tag('a', get_string('switchrolereturn'), array('href'=>$url)).')';
                }
            } else {
                $loggedinas = $realuserinfo.get_string('loggedinas', 'theme_colms', $username);
                if ($withlinks) {
                    $loggout = "<a href=\"$CFG->wwwroot/login/logout.php?sesskey=".sesskey()."\" id='logout'>".get_string('logout').'</a>';
                }
            }
        } else {
            $loggedinas = get_string('loggedinnot', 'theme_colms');
            if (!$loginpage && $withlinks) {
                $loggedinas = "<a href='javascript:void(0)' id='login_button'>".get_string('login').'</a>';
            }
        }
        // if(isloggedin() || isguestuser()){
        // $loggedinas = '<div class="logininfo"><div id="logoutlink">'. $loggedinas .'<a href="javascript:void(0)" id="pop_logout"><img src=' . $OUTPUT->pix_url("down_arrow","theme") .'  /></a></div>', array("class"=>"userimg")) . ''.$loggout.'</div>';
        // }
		if(isloggedin() || isguestuser()){
		$loggout = "<a href=\"$CFG->wwwroot/login/logout.php?sesskey=".sesskey()."\" class='box_log'>".get_string('logout').'</a>';
        $loggedinas = '<div class="logininfo"><div class="logoutlink">'. $loggedinas .'</div><div class="box_log">'.$loggout.'</div></div>';
        }
        if (isset($SESSION->justloggedin)) {
            unset($SESSION->justloggedin);
            if (!empty($CFG->displayloginfailures)) {
                if (!isguestuser()) {
                    if ($count = count_login_failures($CFG->displayloginfailures, $USER->username, $USER->lastlogin)) {
                        $loggedinas .= '&nbsp;<div class="loginfailures">';
                        if (empty($count->accounts)) {
                            $loggedinas .= get_string('failedloginattempts', '', $count);
                        } else {
                            $loggedinas .= get_string('failedloginattemptsall', '', $count);
                        }
                        if (file_exists("$CFG->dirroot/report/log/index.php") and has_capability('report/log:view', context_system::instance())) {
                            $loggedinas .= ' (<a href="'.$CFG->wwwroot.'/report/log/index.php'.
                                                 '?chooselog=1&amp;id=1&amp;modid=site_errors">'.get_string('logs').'</a>)';
//.........這裏部分代碼省略.........

/**
 * Returns text to be displayed to the user which reflects their login status
 *
 * @global object
 * @global object
 * @global object
 * @global object
 * @uses CONTEXT_COURSE
 * @param course $course {@link $COURSE} object containing course information
 * @param user $user {@link $USER} object containing user information
 * @return string HTML
 */
function user_login_string($course = NULL, $user = NULL)
{
    global $USER, $CFG, $SITE, $DB;
    if (during_initial_install()) {
        return '';
    }
    if (empty($user) and !empty($USER->id)) {
        $user = $USER;
    }
    if (empty($course)) {
        $course = $SITE;
    }
    if (session_is_loggedinas()) {
        $realuser = session_get_realuser();
        $fullname = fullname($realuser, true);
        $realuserinfo = " [<a {$CFG->frametarget}\n        href=\"{$CFG->wwwroot}/course/loginas.php?id={$course->id}&amp;return=1&amp;sesskey=" . sesskey() . "\">{$fullname}</a>] ";
    } else {
        $realuserinfo = '';
    }
    $loginurl = get_login_url();
    if (empty($course->id)) {
        // $course->id is not defined during installation
        return '';
    } else {
        if (!empty($user->id)) {
            $context = get_context_instance(CONTEXT_COURSE, $course->id);
            $fullname = fullname($user, true);
            $username = "<a {$CFG->frametarget} href=\"{$CFG->wwwroot}/user/view.php?id={$user->id}&amp;course={$course->id}\">{$fullname}</a>";
            if (is_mnet_remote_user($user) and $idprovider = $DB->get_record('mnet_host', array('id' => $user->mnethostid))) {
                $username .= " from <a {$CFG->frametarget} href=\"{$idprovider->wwwroot}\">{$idprovider->name}</a>";
            }
            if (isset($user->username) && $user->username == 'guest') {
                $loggedinas = $realuserinfo . get_string('loggedinasguest') . " (<a {$CFG->frametarget} href=\"{$loginurl}\">" . get_string('login') . '</a>)';
            } else {
                if (!empty($user->access['rsw'][$context->path])) {
                    $rolename = '';
                    if ($role = $DB->get_record('role', array('id' => $user->access['rsw'][$context->path]))) {
                        $rolename = ': ' . format_string($role->name);
                    }
                    $loggedinas = get_string('loggedinas', 'moodle', $username) . $rolename . " (<a {$CFG->frametarget}\n                      href=\"{$CFG->wwwroot}/course/view.php?id={$course->id}&amp;switchrole=0&amp;sesskey=" . sesskey() . "\">" . get_string('switchrolereturn') . '</a>)';
                } else {
                    $loggedinas = $realuserinfo . get_string('loggedinas', 'moodle', $username) . ' ' . " (<a {$CFG->frametarget} href=\"{$CFG->wwwroot}/login/logout.php?sesskey=" . sesskey() . "\">" . get_string('logout') . '</a>)';
                }
            }
        } else {
            $loggedinas = get_string('loggedinnot', 'moodle') . " (<a {$CFG->frametarget} href=\"{$loginurl}\">" . get_string('login') . '</a>)';
        }
    }
    $loggedinas = '<div class="logininfo">' . $loggedinas . '</div>';
    if (isset($SESSION->justloggedin)) {
        unset($SESSION->justloggedin);
        if (!empty($CFG->displayloginfailures)) {
            if (!empty($USER->username) and $USER->username != 'guest') {
                if ($count = count_login_failures($CFG->displayloginfailures, $USER->username, $USER->lastlogin)) {
                    $loggedinas .= '&nbsp;<div class="loginfailures">';
                    if (empty($count->accounts)) {
                        $loggedinas .= get_string('failedloginattempts', '', $count);
                    } else {
                        $loggedinas .= get_string('failedloginattemptsall', '', $count);
                    }
                    if (has_capability('coursereport/log:view', get_context_instance(CONTEXT_SYSTEM))) {
                        $loggedinas .= ' (<a href="' . $CFG->wwwroot . '/course/report/log/index.php' . '?chooselog=1&amp;id=1&amp;modid=site_errors">' . get_string('logs') . '</a>)';
                    }
                    $loggedinas .= '</div>';
                }
            }
        }
    }
    return $loggedinas;
}

//.........這裏部分代碼省略.........
                 } else {
                     $mnetuserpanel .= $startli;
                     $mnetuserpanel .= html_writer::tag('label', $providername);
                     $mnetuserpanel .= $endli;
                 }
             }
             if ($roleswitched) {
                 $rolename = '';
                 $context = context_course::instance($course->id);
                 if ($role = $DB->get_record('role', array('id' => $USER->access['rsw'][$context->path]))) {
                     $rolename = format_string($role->name);
                 }
                 if (empty($rolename)) {
                     // Specially for Admins - they have no original role Title...
                     $rolename = get_string('admin');
                 }
                 $returnrolelinkparams = array('id' => $course->id, 'sesskey' => sesskey(), 'switchrole' => 0, 'returnurl' => $this->page->url->out_as_local_url(false));
                 $returnrolelink = new moodle_url('/course/switchrole.php', $returnrolelinkparams);
                 $returnrolelink = html_writer::tag('a', $rolename, array('href' => $returnrolelink));
                 // Add a divider if the user is also role switched or MNET
                 $mnetuser || $loggedinasuser ? $roleswitchedpanel .= $divider : null;
                 if ($withlinks) {
                     $roleswitchedpanel .= $startli;
                     $roleswitchedpanel .= html_writer::tag('label', get_string('switchrolereturn'));
                     $roleswitchedpanel .= $endli;
                     $roleswitchedpanel .= html_writer::tag('li', $returnrolelink);
                 } else {
                     $roleswitchedpanel .= $startli;
                     $roleswitchedpanel .= html_writer::tag('label', get_string('role') . ': ' . $rolename);
                     $roleswitchedpanel .= $endli;
                 }
             }
             if ($loggedinasuser) {
                 $realuser = session_get_realuser();
                 $realuser = fullname($realuser, true);
                 $realuserprofilelink = $CFG->wwwroot . '/course/loginas.php?id=' . $course->id . '&sesskey=' . sesskey();
                 $realuserprofile = html_writer::tag('a', $realuser, array('href' => $realuserprofilelink));
                 // Add a divider if the user is also role switched or MNET
                 $mnetuser || $roleswitched ? $loggedinasuserpanel .= $divider : null;
                 if ($withlinks) {
                     $loggedinasuserpanel .= $startli;
                     $loggedinasuserpanel .= html_writer::tag('label', get_string('returntooriginaluser', '', $realuser));
                     $loggedinasuserpanel .= $endli;
                     $loggedinasuserpanel .= html_writer::tag('li', $realuserprofile);
                 } else {
                     $loggedinasuserpanel .= $startli;
                     $loggedinasuserpanel .= html_writer::tag('label', get_string('loggedinas', '', $realuser));
                     $loggedinasuserpanel .= $endli;
                 }
             }
             $hasdropdown = $mnetuser || $roleswitched || $loggedinasuser;
             $dropdown = $mnetuserpanel . $roleswitchedpanel . $loggedinasuserpanel;
             $dropdown = html_writer::tag('ul', $dropdown, array('class' => 'dropdown'));
             if (isguestuser()) {
                 // Guest user
                 $fullname = html_writer::tag('span', $fullname);
                 $loggedinas = $divider . $startli . $fullname . $endli;
                 //@TODO: Write a style to swap tag for span
                 if ($withlinks) {
                     $loggedinas .= $loginbutton;
                 }
             } else {
                 // Normal User
                 if ($withlinks) {
                     //Link to profile page
                     $userprofilelink = $CFG->wwwroot . '/user/profile.php?id=' . $USER->id;

 /**
  * Return the standard string that says whether you are logged in (and switched
  * roles/logged in as another user).
  * @param bool $withlinks if false, then don't include any links in the HTML produced.
  * If not set, the default is the nologinlinks option from the theme config.php file,
  * and if that is not set, then links are included.
  * @return string HTML fragment.
  */
 public function login_info($withlinks = null)
 {
     global $USER, $CFG, $DB, $SESSION;
     if (during_initial_install()) {
         return '';
     }
     if (is_null($withlinks)) {
         $withlinks = empty($this->page->layout_options['nologinlinks']);
     }
     $loginpage = (string) $this->page->url === get_login_url();
     $course = $this->page->course;
     if (\core\session\manager::is_loggedinas()) {
         $realuser = session_get_realuser();
         $fullname = fullname($realuser, true);
         if ($withlinks) {
             $realuserinfo = " [<a href=\"{$CFG->wwwroot}/course/loginas.php?id={$course->id}&amp;sesskey=" . sesskey() . "\">{$fullname}</a>] ";
         } else {
             $realuserinfo = " [{$fullname}] ";
         }
     } else {
         $realuserinfo = '';
     }
     $loginurl = get_login_url();
     if (empty($course->id)) {
         // $course->id is not defined during installation
         return '';
     } else {
         if (isloggedin()) {
             $context = context_course::instance($course->id);
             $fullname = fullname($USER, true);
             // Since Moodle 2.0 this link always goes to the public profile page (not the course profile page)
             if ($withlinks) {
                 $username = "<a href=\"{$CFG->wwwroot}/user/profile.php?id={$USER->id}\">{$fullname}</a>";
             } else {
                 $username = $fullname;
             }
             if (is_mnet_remote_user($USER) and $idprovider = $DB->get_record('mnet_host', array('id' => $USER->mnethostid))) {
                 if ($withlinks) {
                     $username .= " from <a href=\"{$idprovider->wwwroot}\">{$idprovider->name}</a>";
                 } else {
                     $username .= " from {$idprovider->name}";
                 }
             }
             if (isguestuser()) {
                 $loggedinas = $realuserinfo . get_string('loggedinasguest');
                 if (!$loginpage && $withlinks) {
                     $loggedinas .= '<a class="btn btn-small btn-default" href="' . $loginurl . '"><i class="fa fa-sign-in"></i> ' . get_string('login') . '</a>';
                 }
             } else {
                 if (is_role_switched($course->id)) {
                     // Has switched roles
                     $rolename = '';
                     if ($role = $DB->get_record('role', array('id' => $USER->access['rsw'][$context->path]))) {
                         $rolename = ': ' . format_string($role->name);
                     }
                     $loggedinas = get_string('loggedinas', 'moodle', $username) . $rolename;
                     if ($withlinks) {
                         $loggedinas .= ' (<a href="$CFG->wwwroot/course/view.php?id=$course->id&amp;switchrole=0&amp;sesskey=' . sesskey() . '">' . get_string('switchrolereturn') . '</a>)';
                     }
                 } else {
                     $loggedinas = $realuserinfo . get_string('loggedinas', 'moodle', $username);
                     if ($withlinks) {
                         $loggedinas .= '&nbsp;&nbsp;<a class="btn btn-small" href="' . $CFG->wwwroot . '/login/logout.php?sesskey=' . sesskey() . '"><i class="fa fa-sign-out"></i> ' . get_string('logout') . '</a>';
                     }
                 }
             }
         } else {
             $loggedinas = get_string('loggedinnot', 'moodle');
             if (!$loginpage && $withlinks) {
                 $loggedinas .= ' <a class="btn btn-small btn-default" href="' . $loginurl . '"><i class="fa fa-sign-in"></i> ' . get_string('login') . '</a>';
             }
         }
     }
     $loggedinas = '<div class="logininfo">' . $loggedinas . '</div>';
     if (isset($SESSION->justloggedin)) {
         unset($SESSION->justloggedin);
         if (!empty($CFG->displayloginfailures)) {
             if (!isguestuser()) {
                 // Include this file only when required.
                 require_once $CFG->dirroot . '/user/lib.php';
                 if ($count = user_count_login_failures($USER)) {
                     $loggedinas .= '<div class="loginfailures">';
                     $a = new stdClass();
                     $a->attempts = $count;
                     $loggedinas .= get_string('failedloginattempts', '', $a);
                     if (file_exists("{$CFG->dirroot}/report/log/index.php") and has_capability('report/log:view', context_system::instance())) {
                         $loggedinas .= ' (' . html_writer::link(new moodle_url('/report/log/index.php', array('chooselog' => 1, 'id' => 0, 'modid' => 'site_errors')), get_string('logs')) . ')';
                     }
                     $loggedinas .= '</div>';
                 }
             }
         }
//.........這裏部分代碼省略.........