海运的博客

  class Trie{
  public $tree = array();

  public function insert($str){
    $count = strlen($str);
    $T = &$this->tree;
    //关联数组递归各个字符，无则新建
    for($i = 0; $i < $count; $i++){
      $c = $str[$i];
      if (!isset($T[$c]))
        $T[$c] = array();  
      $T = &$T[$c];
    }
  }

  public function remove($chars){
    if($this->find($chars)){    
      $count = strlen($chars);
      $T = &$this->tree;
      for($i = 0;$i < $count;$i++){
        $c = $chars[$i];
        if(count($T[$c]) == 1){     
          unset($T[$c]);
          return true;
        }
        $T = &$T[$c];
      }
    }
  }

  public function find($chars){
    $count = strlen($chars);
    $T = &$this->tree;
    //循环遍历各个字符，如无则返回false
    for($i = 0;$i < $count;$i++){
      $c = $chars[$i];
      if(!array_key_exists($c, $T)){
        return false;
      }
      $T = &$T[$c];
    }
    //否则返回找到
    return true;
  }
}
$t = new Trie();
$t->insert('str');
var_dump($t->find('str'));

更多：
https://github.com/fran6co/phptrie
http://kaiserleib.com/archives/63
http://www.cnblogs.com/endsock/p/3584161.html

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