The problem persists until am last night. can you stay up late today? HELP!

The problem persists until am last night. can you stay up late today? HELP! I want to create an online Q & A system and check if there is a ready-made online Q & A. I will try it and download the source code and upload it to sina Cloud. why is it different from the original one? (No score after answer)
My sina Cloud address: http://1.xyqcsmwly.sinaapp.com/quizphp/quiz.php

Original Demo address: http://www.helloweba.com/demo/quiz/quiz.php

My code:
Quiz. php

 $ Row ['id']. ','. $ row ['question'], 'answers' => $ answers);} $ json = json_encode ($ arr);?>
 
 Demonstration: how to use jQuery + PHP + MySQL to implement an online test project