how to generate unsubscribe link for newsletter?
问题 I want to write a newsletter with php. but i have a question: how can i generate a code for unsubscribe. In fact i want a unique code for each subscriber. for example in 'http://net.tutsplus.com/' you can see something like this:'http://tutsplus.us1.list-manage.com/profile?u=0154weg635df2fdwied2541cbed&id=c5652sdfre7&e=8758563dfgde'. and another question is that this code should be saved in data base or no?(because i think if it's unique for each person, it's not necessary to generate every