Gdn_Session::start PHP Method

    public function start($UserID = false, $SetIdentity = true, $Persist = false)
    {
        if (!c('Garden.Installed', false)) {
            return;
        }
        // Retrieve the authenticated UserID from the Authenticator module.
        $UserModel = Gdn::authenticator()->getUserModel();
        $this->UserID = $UserID !== false ? $UserID : Gdn::authenticator()->getIdentity();
        $this->User = false;
        // Now retrieve user information
        if ($this->UserID > 0) {
            // Instantiate a UserModel to get session info
            $this->User = $UserModel->getSession($this->UserID);
            if ($this->User) {
                if ($SetIdentity) {
                    Gdn::authenticator()->setIdentity($this->UserID, $Persist);
                    Logger::event('session_start', Logger::INFO, 'Session started for {username}.');
                    Gdn::pluginManager()->callEventHandlers($this, 'Gdn_Session', 'Start');
                }
                $UserModel->EventArguments['User'] =& $this->User;
                $UserModel->fireEvent('AfterGetSession');
                $this->permissions->setPermissions($this->User->Permissions);
                $this->_Preferences = $this->User->Preferences;
                $this->_Attributes = $this->User->Attributes;
                $this->_TransientKey = is_array($this->_Attributes) ? val('TransientKey', $this->_Attributes) : false;
                if ($this->_TransientKey === false) {
                    $this->_TransientKey = $UserModel->setTransientKey($this->UserID);
                }
                // Save any visit-level information.
                if ($SetIdentity) {
                    $UserModel->updateVisit($this->UserID);
                }
            } else {
                $this->UserID = 0;
                $this->User = false;
                $this->_TransientKey = getAppCookie('tk');
                if ($SetIdentity) {
                    Gdn::authenticator()->setIdentity(null);
                }
            }
        } else {
            // Grab the transient key from the cookie. This doesn't always get set but we'll try it here anyway.
            $this->_TransientKey = getAppCookie('tk');
        }
        // Load guest permissions if necessary
        if ($this->UserID == 0) {
            $guestPermissions = $UserModel->getPermissions(0);
            $this->permissions->setPermissions($guestPermissions->getPermissions());
        }
    }