I am wondering if there is a good tutorial on how to use php to make users
come from a page before they can access another.  For instance, say you have
one page called index.php which contains a form that once filled in links to
a confirmation page to verify the users data was entered correctly then from
there links to a page that stores the users data into a database table.  The
problem I would like to alleviate is to make sure the users cannot just type
in the name of the last page in the url and put a blank entry into the
database.  I have read a few tutorials on using sessions but I am unclear on
how the use of sessions would require the user to visit each page in
succession.  Thanks in advance,

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