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How to set a session variable when a link is clicked?

I have created a search block. It outputs multiple results (names) as links. User can follow the link. How can I pass the user name into $_SESSION variable?

I tried doing this, the result shows a page not found error.

'name' => l(t($n['name']), 'edit_details' ,array('query' => array('uid' => $n['uid'])))

In hook_menu() I set $items['edit_details/%'] to array(). I passed the value into the session with $_SESSION['id'] = $_GET['uid'];.

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How to set a session variable when a link is clicked?

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