过滤替换文章内的敏感词或字

        //接收关键词
        $str = input('words');
        $txt = ComType::field('title,times,id')->select();
        //得到所有的过滤词
        if (count($txt) > 0) {
            foreach ($txt as $w) {
                $k[] = $w['title'];
            }
        }
        //获取数组
        foreach ($k as $key => $val) {
            //去空格
            $val = trim($val);
            //正则过滤
            preg_match('/' . $val . '/', $str, $matches);
            //替换掉敏感词
            if (!empty($matches[0])) {
                $str =  str_replace($val, "***", $str);
            }
            //收集所有的敏感词
            $m[] = $matches;
        };
        //判断是否存在敏感词
        $r = strpos($str, '*');
        if ($r != false || $r == 0) {
            //统计匹配次数
            if ($m) {
                foreach ($m as $i) {
                    if ($i) {
                        $t = ComType::where('title', $i[0])->find();
                        if ($t) {
                            ComType::where('id', $t['id'])->update(['times' => $t['times'] + 1]);
                        }
                    }
                }
            }
            return json(['code' => 1, 'data' => $str, 'msg' => "评论中含有敏感字或词"]);
        } else {

            return json(['code' => 2, 'data' => '', 'msg' => "评论中无敏感词或字"]);
        }
    }