Sensitive word filtering php class library

<?php
class Logic_BlackWord
{
  const APP_FORUM = 1;
  const APP_BLOG  = 2;
  const APP_VOTE  = 3;
  public function getHitList($txt)
  {
    $hitList = array();
    $max = $this->getMax();
    if($max)
    {
      $size = 1000;
      $last = ceil($max/$size);
      for($page=1;$page<=$last;$page++)
      {
        $result = $this->getHitListByPage($txt,$page,$size);
        if($result) $hitList = array_merge($hitList,$result);
      }
    }
    $hitList2 = array();
    foreach($hitList as $hit=>$type)
    {
      $hitList2[$type][] = $hit;
    }
    return $hitList2;
  }

The sensitive word replacement algorithm of this class library is 4 times more efficient than str_replace (6,000 sensitive words attached). This class library was written when I had not studied Trie trees. After that, I came into contact with the AC algorithm. The algorithm has a similar structure and logic to AC. They both use trees to exchange space for time, which is very helpful for searching/replacing massive data.
strtr is the representative of the KMP algorithm. It has no advantage in dealing with massive vocabulary, and the vocabulary library must be loaded into the memory every time.
Using the AC algorithm to write extensions and loading the vocabulary into memory is the best way to handle it.
So badword.src.php can be used to learn AC algorithm, learn search and replace, etc.

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