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How to check if session is active or not?

 
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Hi,
I am making a shopping site. I want that when customer first presses
"Add to Cart" button, then he is shown login page and for every next click his item is added to the cart.
I want to know how can we find that user has already logged in? Also I want that once user has logged in, he is redirected to same page from where he come.
Please tell me how we do this?
Thanks.
Abhishek
 
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You can store a flag in the session after the user logs in.
When the user logs out the flag can be removed from the session.Based on the presence of the flag you would know if the user has already logged in.
If so you can redirect accordingly.
Is this the one you are lokking for.
 
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