Is it possible create a PHP login System without mysql [on hold]

Question

Instead of MySQL, I must create a multidimensional array which will be like this:

------------------------------
-     **Password**Name**Email-
-Login**--------**----**------
-Login**--------**----**------
-Login**--------**----**------
-Login**--------**----**------
-Login**--------**----**------
------------------------------

Where login must be unique.

Answer 1

Yes.

You can create a json object, and pars it. Or just write the array to a file and read from it. Of corse you will still need to pars it.

But why? It is great for study purposes only. Don't see any other reason.