function badwords($content){

    $keywords=M("config")->where("name='badwords'")->getField("value");

    $badwords = explode(",",$keywords); //关键词的数组

    $badword1 = array_combine($badwords,array_fill(0,count($badwords),'***'));

    $str = strtr($content, $badword1);

    $pattern = "/(\d{0})\d{5}(\d{0})/";

    $replacement = "\$1****\$2";

    $res =  preg_replace($pattern, $replacement, $str); //这个是去除连续的数字

    return $res;

}