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Homephp教程php手册gzip文件和字符串解压实例教程

要采集一个网站,目标站采用了gzip压缩传输网页,本来应该只要发送一个http头 Accept-Encoding: identity或者干脆不发送这个头等,就可以使目标站返回没有经过gzip压缩的页面了,不过很不幸,目标站无视客户端的请求,仍然返回gzip数据,造成乱码。

其实php对gzip解压很简单,用内置的gzdecode函数就可以了,不过很可惜我配置了半天也无法支持gzdecode函数,所以只好变通一下:

以下为引用的内容:

if (!function_exists('gzdecode')) {
function gzdecode ($data) {
$flags = ord(substr($data, 3, 1));
$headerlen = 10;
$extralen = 0;
$filenamelen = 0;
if ($flags & 4) {
$extralen = unpack('v' ,substr($data, 10, 2));
$extralen = $extralen[1];
$headerlen += 2 + $extralen;
}
if ($flags & 8) // Filename
$headerlen = strpos($data, chr(0), $headerlen) + 1;
if ($flags & 16) // Comment
$headerlen = strpos($data, chr(0), $headerlen) + 1;
if ($flags & 2) // CRC at end of file
$headerlen += 2;
$unpacked = @gzinflate(substr($data, $headerlen));
if ($unpacked === FALSE)
$unpacked = $data;
return $unpacked;
}
}

调用方法很简单:

以下为引用的内容:

$f=@file_get_contents("http://www.itlearner.com");
echo gzdecode($f);



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