[quote]It says I should use
But does not say where or how to use them.
I don’t understand how that works.[/quote]
It is all predefined variables used by PHP to get value from cookies and session you set, form submission field value, and server environment.
They are all array variables that you can access using index mechanism, eg:
Anyway, in order to understand that variables I recommend you learn how website work especially using PHP.
There are many good books on PHP, I recommend this one.
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