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Answer - $message is used to store variable data. $$message can
be used to store variable of a variable.............
Answer - Cookies are often used to track user
information.............
What
is the difference between include and require?
Answer - Require () and include () are the same with respect to
handling failures.............
What
is urlencode and urldecode?
Answer - Urlencode can be used to encode a string that can be
used in a url.............