curl 和 file_get_contents 抓取网页乱码的解决之道

<?php
    $tmp = sys_get_temp_dir();
    $cookieDump = tempnam($tmp, 'cookies');
    $url = 'http://tv.sohu.com';
    $ch = curl_init();
    curl_setopt ($ch, CURLOPT_URL, $url);
    curl_setopt ($ch, CURLOPT_HEADER, 1);// 显示返回的Header区域内容
    curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1); // 使用自动跳转
    curl_setopt ($ch, CURLOPT_TIMEOUT, 10);// 设置超时限制
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1); // 获取的信息以文件流的形式返回
    curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT,10);// 链接超时限制
    curl_setopt ($ch, CURLOPT_HTTPHEADER,array('Accept-Encoding: gzip, deflate'));//设置 http 头信息
    curl_setopt ($ch, CURLOPT_ENCODING, 'gzip,deflate');//添加 gzip 解码的选项，即使网页没启用 gzip 也没关系
    curl_setopt ($ch, CURLOPT_COOKIEJAR, $cookieDump);  // 存放Cookie信息的文件名称
    $content = curl_exec($ch);
    // 把抓取的网页由 GBK 转换成 UTF-8 
    $content = mb_convert_encoding($content,"UTF-8","GBK");
?>

<?php
    $url = 'http://tv.sohu.com';
    // 只要添加 compress.zlib 选项，即使服务器启用了gzip 压缩功能，就能够解码了
    $content = file_get_contents("compress.zlib://".$url);
    // 把抓取的网页由 GBK 转换成 UTF-8 
    $content = mb_convert_encoding($content,"UTF-8","GBK");
?>