Passing Customer Id In Outlink

[karthikcs]

In the short description of the product I have a hyperlink

(domain.com/some/thing?utm_source=shortdesc&utm_campaign=product&user_id=$customer_id)

 

How do I add customer_id dynamically to the hyperlink if the customer is logged and leave blank or null if not logged in.

Edited December 24, 2015 by karthikcs (see edit history)

[bellini13]

this will not be a simple change.  the product description is saved in the database, and obviously is displayed for every customer the same way.  so, you would have to override the product controller so that after the product information is loaded from the database, it would check if a customer object exists, and if so, it would include the user_id=$customer->id in that link, if the link exists.

[karthikcs]

Thank you Bellini Services for the help.

 

Can someone guide me in doing this.