PHP test questions, help with answers

Question

Help me answer this question. I am not a professional who studies this. Thank you

Answer 1

You can refer to: https://www.php.cn/course/37.html

Answer 2

You don’t do any homework assigned by others, and you just rely on asking for help?

Answer 3

It just ended, so helpless. Let’s write this directly by referring to MySQL books. The main content is SQL statements.