thinkphp在富文本中获取简介

/**
 * 过滤html和img
 */
if (!function_exists('trimall')) {
    function trimall($str)
    {
        $qian = array(" ", "　", "\t", "\n", "\r", " ", "&", "nbsp", ";");
        $str = str_replace($qian, '', $str);
        preg_replace('/<\s+img[^>]+>/i', '', $str);
        preg_replace('/<\s*img\s+[^>]*?src\s*=\s*(\'|\")(.*?)\\1[^>]*?\/?\s*>/i', '', $str);
        return preg_replace("/<img.*?>/si", "", $str);
    }
}

  public function getDescribeAttr($value, $data)
      {
          if (empty($value)) {
              $str = mb_strcut(trimall(strip_tags($data['content'])), 0, 200, 'utf-8');
              return $str;
          }
          return $value;
      }