What I'm doing here is fairly obvious (build a comma-delimited

$arr = array(1,2,3,4,5);

for ($i=0; $i< sizeof($arr); $i++) {
        $lis = $lis . $arr[$i];
        if ($i != (sizeof($arr)-1)) {
                $lis = $lis . ',';

Question is, is there a more elegant way? I'm thinking of something
like DTML's sequence-start and sequence-end, in a foreach


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