How can I rewrite this code to improve its clarity?

Posted by eric on Stack Overflow See other posts from Stack Overflow or by eric
Published on 2010-03-27T18:21:31Z Indexed on 2010/03/27 18:43 UTC
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Could you write this 'cleaner' ? Just a simple question from a beginner:)

if(isset($_GET['tid']) && trim($_GET['tid'])!==""){
$act = 'tid';
$tid = trim($_GET['tid']);

}elseif(isset($_GET['fid']) && trim($_GET['fid'])!==""){
$act = 'fid';
$fid = trim($_GET['fid']);

}elseif(isset($_GET['mid']) && trim($_GET['mid'])!==""){
$act = 'mid';

}elseif(isset($_GET['act']) && trim($_GET['act'])!==""){
$act = trim($_GET['act']);

}else{
$act = "";
}

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