使用file_get_contents()获取sohu博客乱码问题

问题：

$html=file_get_contents('http://xuxiaonian.blog.sohu.com/160201697.html');
var_dump($html);

最后打印出来的结果都是乱码
，经测试，新浪博客不会出现此问题，只有搜狐博客有次问题

原因：

获取的头部当中有Content-Encoding: gzip说明内容是GZIP压缩的 解压后就能得到内容了

PHP内置的file_get_contents不支持GZIP 可以试试CURL 好象能处理GZIP

array(11) {

[0]=>

string(15) "HTTP/1.1 200 OK"

[1]=>

string(35) "Content-Type: text/html;charset=gbk"

[2]=>

string(17) "Connection: close"

[3]=>

string(13) "Server: nginx"

[4]=>

string(35) "Date: Fri, 29 Oct 2010 00:36:51 GMT"

[5]=>

string(26) "Vary: Host,Accept-Encoding"

[6]=>

string(14) "Pragma: Public"

[7]=>

string(26) "Cache-Control: max-age=300"

[8]=>

string(38) "Expires: Fri, 29 Oct 2010 00:41:53 GMT"

[9]=>

string(22) "Content-Encoding: gzip
"

[10]=>

string(14) "FSS-Cache: HIT"

}

解决办法：

1.定义一位外国高人写的gzip解码函数gzdecode():

function gzdecode($data) {
$len = strlen($data);
if ($len < 18 || strcmp(substr($data,0,2),"/x1f/x8b")) {
return null;  // Not GZIP format (See RFC 1952)
}
$method = ord(substr($data,2,1));  // Compression method
$flags  = ord(substr($data,3,1));  // Flags
if ($flags & 31 != $flags) {
// Reserved bits are set -- NOT ALLOWED by RFC 1952
return null;
}
// NOTE: $mtime may be negative (PHP integer limitations)
$mtime = unpack("V", substr($data,4,4));
$mtime = $mtime[1];
$xfl   = substr($data,8,1);
$os    = substr($data,8,1);
$headerlen = 10;
$extralen  = 0;
$extra     = "";
if ($flags & 4) {
// 2-byte length prefixed EXTRA data in header
if ($len - $headerlen - 2 < 8) {
return false;    // Invalid format
}
$extralen = unpack("v",substr($data,8,2));
$extralen = $extralen[1];
if ($len - $headerlen - 2 - $extralen < 8) {
return false;    // Invalid format
}
$extra = substr($data,10,$extralen);
$headerlen += 2 + $extralen;
}
$filenamelen = 0;
$filename = "";
if ($flags & 8) {
// C-style string file NAME data in header
if ($len - $headerlen - 1 < 8) {
return false;    // Invalid format
}
$filenamelen = strpos(substr($data,8+$extralen),chr(0));
if ($filenamelen === false || $len - $headerlen - $filenamelen - 1 < 8) {
return false;    // Invalid format
}
$filename = substr($data,$headerlen,$filenamelen);
$headerlen += $filenamelen + 1;
}
$commentlen = 0;
$comment = "";
if ($flags & 16) {
// C-style string COMMENT data in header
if ($len - $headerlen - 1 < 8) {
return false;    // Invalid format
}
$commentlen = strpos(substr($data,8+$extralen+$filenamelen),chr(0));
if ($commentlen === false || $len - $headerlen - $commentlen - 1 < 8) {
return false;    // Invalid header format
}
$comment = substr($data,$headerlen,$commentlen);
$headerlen += $commentlen + 1;
}
$headercrc = "";
if ($flags & 1) {
// 2-bytes (lowest order) of CRC32 on header present
if ($len - $headerlen - 2 < 8) {
return false;    // Invalid format
}
$calccrc = crc32(substr($data,0,$headerlen)) & 0xffff;
$headercrc = unpack("v", substr($data,$headerlen,2));
$headercrc = $headercrc[1];
if ($headercrc != $calccrc) {
return false;    // Bad header CRC
}
$headerlen += 2;
}
// GZIP FOOTER - These be negative due to PHP's limitations
$datacrc = unpack("V",substr($data,-8,4));
$datacrc = $datacrc[1];
$isize = unpack("V",substr($data,-4));
$isize = $isize[1];
// Perform the decompression:
$bodylen = $len-$headerlen-8;
if ($bodylen < 1) {
// This should never happen - IMPLEMENTATION BUG!
return null;
}
$body = substr($data,$headerlen,$bodylen);
$data = "";
if ($bodylen > 0) {
switch ($method) {
case 8:
// Currently the only supported compression method:
$data = gzinflate($body);
break;
default:
// Unknown compression method
return false;
}
} else {
// I'm not sure if zero-byte body content is allowed.
// Allow it for now...  Do nothing...
}
// Verifiy decompressed size and CRC32:
// NOTE: This may fail with large data sizes depending on how
//       PHP's integer limitations affect strlen() since $isize
//       may be negative for large sizes.
if ($isize != strlen($data) || crc32($data) != $datacrc) {
// Bad format!  Length or CRC doesn't match!
return false;
}
return $data;
}

2.调用此函数将获得的数据解码

$html=file_get_contents('http://xuxiaonian.blog.sohu.com/160201697.html');
$html=gzdecode($html);

iehttpheaders,httpwatch,FF的LiveHTTPHeaders,,FF的firebug,FF的httpfox都可以看头部信息的，还有其它很多工具。