优化DedeCMS搜索结果不匹配问题

foreach($typeArr as $id=>$typename){
    $keywordn = str_replace($typename, ' ', $keyword);
    if($keyword != $keywordn)
    { 

foreach($typeArr as $id=>$typename){
    //$keywordn = str_replace($typename, ' ', $keyword);
    $keywordn = $keyword;
    if($keyword != $keywordn)
    {