what is the difference between $_ENV , $_SESSION and $_COOKIE

Question

Mostly i have used $_SESSION, But while reading about Session i got few terms

$_ENV &

$_COOKIE.

I am not getting clear about when to use which one, i am confuse about the situation where i can use them. So How these term are different?

Answer 1

You can read: http://php.net/manual/en/language.variables.superglobals.php.