gistfile1.php

            $words = explode(" ",$trendResults['model_words']);
            $weights = explode(" ",$trendResults['model_weight']);
            $word_weights = array();
            for ( $i = 0; $i <= sizeof($words); $i += 1) {
              $word_weights[$i] = $weights[$i];
            }
            arsort($word_weights);
            $wordLimit = 4;
            $idxs = array();
            foreach($word_weights as $index => $weight){
              if ($wordLimit) {
                $idxs[] = $index;
                --$wordLimit;
              }
            }
            foreach ($words as $idx => $word) {
              if (in_array($idx, $idxs)) {
                echo $word . " ";
              }
            }