Words Frequency Counter - Simple and fast

WordsFrequencyCounter.php

<?php
/**
 * @author: Ido Green
 * @date 6/28/2015
 * @desc: Analyze the words from our firebase DB.
 * Steps:
 * 1. Fetch text from the DB
 * 2. Split into words
 * 3. Remove 2 character words and stopwords
 * 4. Determine word frequency + density
 * 5. Determine word prominence
 * 6. Determine word containers
 */
class AnalyzeWords {
  
  private $db;

  /**
   * Ctor
   */
  function __construct() {
    $this->db = new DB();
  }

  function analyze() {
    $result = $this->db->getItems();
    $fullText = "";
    foreach ($result as $val) {
      $title = $val->title;
      $fullText .= $title;
    }
    $words = mb_split( ' +', $fullText );
    $keywords = array();
    foreach ($words as $word) {
      $vv = strlen($word);
      if (strlen($word) > 4) {
        array_push($keywords, $word);
      }
    }
    
    // $keywords is the $words array after being filtered to contain only words that got 3 chars.
    $uniqueWords = array_unique ($keywords); 
    $uniqueWordCounts = array_count_values ( $keywords );
    echo "Words: " . count($words) . " Keywords: " . count($keywords) . "  unique Words: " . count($uniqueWords) ;
    echo "\n==\n\n-- Unique Word Counts -- \n\nFreq , Word \n";
    //ksort($uniqueWordCounts);
    array_multisort($uniqueWordCounts, SORT_DESC);
    $i = 0;
    foreach ($uniqueWordCounts as $key => $value) {
      echo "$key , $value \n";
      if ($i > 100) {
        break;
      }
      $i++;
    }
  }
}

//
// Start the party
// 
$analyzer = New AnalyzeWords();
$analyzer->analyze();