在php中的会话范围内存储数据的方式和生命周期

Question

Is there a way of storing variables in a PHP application in the session scope or the application scope...? At the same time can someone please explain the life cycle of a php program..? Thanx...

Answer 1

• For the application scope you can use the define function.
• For the session scope you can use the $_SESSION array.
• For the third question....too too broad.Anyway you can take a look to this tutorial . Just Google it.

Answer 2

life cycle of a php program is very short.
It's not like a desktop application constantly running in your browser, and not even a demon with persistent connection to your desktop application. It's more like a command line utility - doing it's job and exits. It runs discrete:

1. a browser makes a call
2. PHP wakes up, creates an HTML page, sends it to the browser and dies
3. Browser renders that HTML and shows it to the user.
4. User clicks a link
5. a browser makes a call
6. another PHP instance, knowing nothing of the previous call, wakes up and so on

That's why you need sessions - to save the variables between calls.