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Why does setcookie function not work?

Last Modified: 2012-05-06

I am trying to edit a PHP script and now it started to feel tired. What I'm trying to do is setting a cookie but it was not possible because of a headers already sent error. Then, I added "obstart()" at the beginning of the page to solve the problem. It worked flawless but the problem is now I cannot delete these cookies by setting them to a prior date when users log out.

It looks like PHP totally ignores the setcookie() function. The same thing happened while creating them but was solved after adding obstart() at the start. Same trick doesn't work in my logout.php

Any ideas?
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