为什么不能使用$ session_start（）？

Question

I got this error.

Notice: Undefined variable: session_start in C:\wamp\www\check.php on line 3

It says undefined variable on line 3, but here's line 3.

$session_start();

Why is this happening? Isn't session_start predefined?

Answer 1

session_start() is a function.

$session_start would be a variable if you defined it. The error message you're reading is simply telling you that the variable that you're trying to call as a function doesn't exist as such.

Answer 2

session_start()

这不是一个变量。

Answer 3

session_start() is not a variable, but a function. You do not need the dollar sign. Change it to

session_start()

and it should work.

Answer 4

It's just session_start() with no $. See the manual .