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How to calculate screen time and insert in to table without refreshing page in PHP?

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I have a question and answer quiz type website in which there will be 30 questions will be there. Each question will open individually and in one php page using question id's.

I m trying to calculate and note down number of seconds a user spent in each question and insert them in a table, as well as update that value whenever user returns back to the question with added seconds.

I m a rookie php and i m not at all good at js or jquery.

Any help is greatly appreciated..


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