PHP 过滤html和img

  //字符串过滤html和img
    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);
    }