Doubt in Redirecting

Hi All,


I  have a doubt with Redirecting.
I am using PHP with mysql.
My Need is :
                  If i click the link then it check the
cookies user
id stored or not ? If cookie stored user_id from the
database then
rediredt into the page. oterwise redirect into Registration
page,
after got register then move into the page. 

How can i do this  ??

Help me.


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