php curl获取网页内容乱码和获取不到内容的解决方法

$url = 'http://www.du52.com';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.22 (KHTML, like Gecko) Chrome/25.0.1364.172 Safari/537.22");
curl_setopt($ch, CURLOPT_ENCODING ,'gzip'); //加入gzip解析
$output = curl_exec($ch);
$info = curl_getinfo($ch);
curl_close($ch);

var_dump($info);
var_dump($output);

$url = 'http://www.mkv8.com';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.22 (KHTML, like Gecko) Chrome/25.0.1364.172 Safari/537.22");
curl_setopt($ch, CURLOPT_FOLLOWLOCATION ,1); //加入重定向处理
$output = curl_exec($ch);
$info = curl_getinfo($ch);
curl_close($ch);

var_dump($info);
var_dump($output);