如果有两个来自不同位置的用户，我的php网站中的变量是否可以写入？ [关闭]

Question

I am making a quiz in PHP. I have many questions in my database, User will select the category, and the questions from that category will be displayed.

I have two questions regarding this:

1. Can I display questions one by one in php without using java script?
2. When there are two users on my site, and they select two different categories, will the variable I am posting to the database be overwritten?

Answer 1

Use sessions (Reference). at the very top of your php file type:

session_start();

and then you can use it as global variables unique to every user. For example:

$_SESSION['last_question_id'] = 3;
$_SESSION['score_so_far'] += 1; // increases score by one

etc.

Also, please be more specific with your problem, maybe post some code or specific situations.