Is the array variable $ _ POST [] the same for different users?

Is the array variable $ _ POST [] the same for different users? For example, if user A accesses index. php, the content of his $ _ POST [] array is the same as the content of the $ _ POST [] array variable when user B accesses it? Are they the same variables?

Which variables are different for accessing users? Which variables are shared by users?

Reply to discussion (solution)

Are they the same?
Not necessarily. if there is a user input, it may be different.
Are they the same variables?
Yes

This is obtained from the client, so it may be the same or different.