I have an equation question with question code Equation1. I can access it in other questions using {Equestion}. How can I access it in plugin php similarly (I mean without knowing $qid)? 

Is it possible to access it directly in javascript too via the question code?

 

I don't understand your need here …

gitlab.com/SondagesPro/coreAndTools/getQuestionInformation
or
via ExpressionManager
gitlab.com/SondagesPro/ExportAndStats/pd.../pdfReport.php#L1041

I found an answer for javascript here:
forums.limesurvey.org/forum/can-i-do-thi...stions-in-javascript

I was also looking for how to do this in php for plugins. I'll try
LimeExpressionManager::ProcessStepString($string, $replacementFields ,3 , true );

Thanks a lot!