php 纯文本输出html

   //纯文本输出

    /**纯文本输出
     * @param $string 字符串
     * @param $len 截取长度
     */
    public  function fromat_html($string,$len){
        $string ="<p style=\"font-family: Simsun; font-size: 14px; line-height: 21px; white-space: normal;\">人情如风，有冷有暖，情难舍，轻落，一点一点消融，</p><p style=\"font-family: Simsun; font-size: 14px; line-height: 21px; white-space: normal;\">　　<a href=\"http://www.duwenzhang.com/huati/shengming/index1.html\" style=\"color: rgb(51, 51, 51); text-decoration: none;\">生命</a>如席，有酸有甜，心难留，遥望，一丝一丝<a href=\"http://www.duwenzhang.com/huati/xintong/index1.html\" style=\"color: rgb(51, 51, 51); text-decoration: none;\">心痛</a>，</p><p style=\"font-family: Simsun; font-size: 14px; line-height: 21px; white-space: normal;\">　　走得太急，脚累，要求太高，难免就会失落</p><p style=\"font-family: Simsun; font-size: 14px; line-height: 21px; white-space: normal;\">　　想得太多，心累，<a href=\"http://www.duwenzhang.com/huati/zhuiqiu/index1.html\" style=\"color: rgb(51, 51, 51); text-decoration: none;\">追求</a>太多，难免不知所措，</p><p style=\"font-family: Simsun; font-size: 14px; line-height: 21px; white-space: normal;\">　　没有<a href=\"http://www.duwenzhang.com/huati/shiyan/index1.html\" style=\"color: rgb(51, 51, 51); text-decoration: none;\">誓言</a>，脉脉相连，生命就多了一份别样的<a href=\"http://www.duwenzhang.com/huati/sinian/index1.html\" style=\"color: rgb(51, 51, 51); text-decoration: none;\">思念</a>，</p><p style=\"font-family: Simsun; font-size: 14px; line-height: 21px; white-space: normal;\">　　两两相望，天涯相伴，<a href=\"http://www.duwenzhang.com/wenzhang/renshengzheli/\" style=\"color: rgb(51, 51, 51); text-decoration: none;\">人生</a>不就是若远若近的距离，</p><p style=\"font-family: Simsun; font-size: 14px; line-height: 21px; white-space: normal;\">　　</p>";

        $string= preg_replace('/(style=".*?")/','', $string);
        $string= preg_replace('/(id=".*?")/','', $string);
        $string= preg_replace("/<style.*?style>/is","",$string);
        $string= preg_replace("/<a.*?a>/is","",$string);
        $string= preg_replace("/[p|P]/","",$string);
        $string= preg_replace("/[<|>]/","",$string);
        $string= preg_replace("/\//","",$string);
        $string= preg_replace("/\s/","",$string);
        $string= preg_replace("/\n\r/","",$string);
        $string= preg_replace("/\t/","",$string);
        $string= preg_replace("/　/","",$string);
        $string= preg_replace('/<string(src="|alt=")/',"<string $1",$string);
        $string= preg_replace('/<a(href=")/',"<a $1",$string);
        return mb_substr($string, 0, $len, 'utf-8');
    }