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You can get the full version of this extension in the link https://github.com/php-cuong/magento2-product-question-and-answer-pro This professional version of this ...

how can I use php to display question stored in mysql database and choose the right answer for it and give grade if the answer is right and store it back in mysql database (sorry I don't speak English ...

Occasionally it may be useful to visualize a continuous stream of data arriving through a serial connection as a web page in a browser. But how do you go about? May we suggest a bit of scripting?