I hope that there will be a logic process before the questionnaire is loaded, and an event will be triggered before the welcome page. Does limesurvey have such an event?
I can only add code to application/controllers/survey/index.php 608 line now,
eg:
$event = new PluginEvent('beforeSurvey');
$event->set('surveyId', $surveyid);
App()->getPluginManager()->dispatchEvent($event);

Is there a better way? Or comes with the system? Or I submit to github?

What purpose exactly ?

manual.limesurvey.org/AfterFindSurvey
manual.limesurvey.org/BeforeSurveyPage
manual.limesurvey.org/ExpressionManagerStart
manual.limesurvey.org/SetVariableExpressionEnd

> before the welcome page

You can use manual.limesurvey.org/GetPluginTwigPath here too
Usage sample : gitlab.com/SondagesPro/coreAndTools/auto...SaveAndQuit.php#L333

I hope it will only be triggered once before the welcome, and will not be triggered later

beforeSurveyPage && beforeSurveyDynamicSave Unable to meet demand...

liumingjun wrote: I hope it will only be triggered once before the welcome, and will not be triggered later

You can test if $_SESSION is set or not in beforeSurveyPage

If not set and survey is active (and don't have token) : it's the welcome page.
If have token : is_empty($_SESSION) && isset(App()-getRequest()->getParam('token'))



Again : purpose

I understand what you mean, I will try, thank you,

g day

very interesting - can we have some more infos on that topic?

this would be nice