laravel实现敏感词汇过滤

最近项目有需求，要对用户的签名，回复进行敏感词检测，然后搜到了一个好用的扩展，分享给大家。

https://github.com/FireLustre/php-dfa-sensitive

通过 composer 进行安装：

composer require lustre/php-dfa-sensitive

然后在 app 目录下创建 Services ，并添加 SensitiveWords.php

<?php

namespace App\Services;

use DfaFilter\SensitiveHelper;

class SensitiveWords
{
    protected static $handle = null;

    private function __construct()
    {
    }

    private function __clone()
    {
    }

    /**
     * 获取实例
     */
    public static function getInstance($word_path = [])
    {
        if (!self::$handle) {

            //默认的一些敏感词库
            $default_path = [
                storage_path('dict/bk.txt'),
                storage_path('dict/fd.txt'),
                storage_path('dict/ms.txt'),
                storage_path('dict/qt.txt'),
                storage_path('dict/sq.txt'),
                storage_path('dict/tf.txt'),
            ];

            $paths = array_merge($default_path, $word_path);

            self::$handle = SensitiveHelper::init();

            if (!empty($paths)) {
                foreach ($paths as $path) {
                    self::$handle->setTreeByFile($path);
                }
            }
        }
        return self::$handle;
    }

    /**
     * 检测是否含有敏感词
     */
    public static function isLegal($content)
    {
        return self::getInstance()->islegal($content);
    }

    /**
     * 敏感词过滤
     */
    public static function replace($content, $replace_char = '', $repeat = false, $match_type = 1)
    {
        return self::getInstance()->replace($content, $replace_char, $repeat, $match_type);
    }

    /**
     * 标记敏感词
     */
    public static function mark($content, $start_tag, $end_tag, $match_type = 1)
    {
        return self::getInstance()->mark($content, $start_tag, $end_tag, $match_type);
    }

    /**
     * 获取文本中的敏感词
     */
    public static function getBadWord($content, $match_type = 1, $word_num = 0)
    {
        return self::getInstance()->getBadWord($content, $match_type, $word_num);
    }
}

然后我们就可以在项目中，使用 SensitiveWords::getBadWord() 来获取文本中是否有敏感词。

$bad_word = SensitiveWords::getBadWord($content);
if (!empty($bad_word)) {
    throw new \Exception('包含敏感词:' . current($bad_word));
}

在 storage 目录下创建 dict 目录存放敏感词词库，bk.txt .....等等，这些词库都是我在网上下载的。