php实现字典数标签，打标签给文章

class Tag
{
    public static function addTag($str, $arr)
    {
        $head = new Node;   // 树的head
        self::addString($head,$arr);
        exit;
        $str = trim($str);
        $result = self::searchString($head,$str);
        $result = array_unique($result);
        return $result;
    }
    /* 添加字符串 */
    private static function addString(&$head, $arr = []){
        foreach($arr as $key => $item) {
            $node = null;
            for ($i=0; $i < mb_strlen($item); $i++) {
                $char = mb_substr($item,$i,1);
                if($char != ''){
                    $is_end = $i != (mb_strlen($item) - 1) ? false : true;
                    if($i == 0){
                        if($is_end){
                            $node = $head->addChildNode($char, $key);
                        }else{
                            $node = $head->addChildNode($char, 0);
                        }
                    }else{
                        if($is_end){
                            $node = $node->addChildNode($char, $key);
                        }else{
                            $node = $node->addChildNode($char, 0);
                        }
                    }
                }
            }
        }
    }

    /* 搜索 */
    private static function searchString($node, $str){
        $head = $node;
        $result = [];
        $depth = 0;
        for ($i=0; $i < mb_strlen($str); $i++) {
            $char = mb_substr($str,$i,1);
            if($char != ''){
                $node = $node->searchChildNode($char);
                // print_r($node);
                if($node === false){
                    //没有找到
                    $i=$i-($depth-1);
                    $depth=0;
                    $node = $head;
                }elseif($node->id){
                    // 找到了
                    $result[]=$node->id;
                    $node = $head;
                    $depth = 0;
                }swo
                $depth++;
            }
        }
        return $result;
    }

    ///* 获取所有字符串--递归 */
    private static function getChildString($node, $str_array = array(), $str = ''){
        if($node->id){
            $str_array[] = $node->id;
        }
        if(empty($node->childNode)){
            return $str_array;
        }else{
            foreach ($node->childNode as $k => $v) {
                $str_array = getChildString($v, $str_array, $str . $v->value);
            }
            return $str_array;
        }
    }
}

class Node{
    public $value;                 // 节点值
    // public $is_end = false;        // 是否为结束--是否为某个标签的结束节点
    public $id = 0;        // 标签id
    public $childNode = array();   // 子节点

    /* 添加孩子节点--注意：可以不为引用函数，因为PHP对象赋值本身就是引用赋值 */
    public function &addChildNode($value, $id = 0){
        $node = $this->searchChildNode($value);
        if(empty($node)){
            // 不存在节点，添加为子节点
            $node = new Node();
            $node->value = $value;
            $this->childNode[] = $node;
        }
        $node->id = $id;
        return $node;
    }

    /* 查询子节点 */
    public function searchChildNode($value){
        foreach ($this->childNode as $k => $v) {
            if($v->value == $value){
                // 存在节点，返回该节点
                return $this->childNode[$k];
            }
        }
        return false;
    }
}