解决http请求字符乱码的bug
上次介绍的http请求函数足够用了，可是在某些时候从浏览器打开url是正常的，使用request_url却只得到一堆乱码，于是翻看手册发现，是由于该url所在的服务器开启了gzip压缩导致。使用curl扩展进行请求时记得开启gzip自动解压
curl_setopt($ch, CURLOPT_ENCODING, 'gzip')
另外，如果没有使用curl，而是使用而是使用fsockopen或file_get_contents，需要手动解压，当PHP>=5.4时，使用gzdecode函数对这些乱码解码，当PHP<5.4的时候，需要自行实现解压函数（可以在PHP手册上找到）。
/**
* 发送http请求
* @param $url 请求地址
* @param $postFields HTTP方法为POST时的请求参数
* @return string HTTP请求相应结果
*/
function request_url($url, $postFields = null) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_FAILONERROR, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
//https 请求
if(strlen($url) > 5 && strtolower(substr($url,0,5)) == 'https') {
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
}
//定义一批浏览器UA
$browser = array(
'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-us) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50',
'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0',
'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0)',
'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)',
'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)',
'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0.1) Gecko/20100101 Firefox/4.0.1',
'Mozilla/5.0 (Windows NT 6.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1',
'Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; en) Presto/2.8.131 Version/11.11',
'Opera/9.80 (Windows NT 6.1; U; en) Presto/2.8.131 Version/11.11',
'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_0) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36',
);
//随机选择一个UA
$default_browser = $browser[array_rand($browser)];
curl_setopt($ch, CURLOPT_USERAGENT, $default_browser);
curl_setopt($ch, CURLOPT_REFERER, $url);
//防止乱码
curl_setopt($ch, CURLOPT_ENCODING, 'gzip');
//判断是否为POST请求
if (is_array($postFields) && 0 < count($postFields))
{
$postBodyString = "";
$postMultipart = false;
foreach ($postFields as $k => $v)
{
if("@" != substr($v, 0, 1))//判断是不是文件上传
{
$postBodyString .= "$k=" . urlencode($v) . "&";
}
else//文件上传用multipart/form-data，否则用www-form-urlencoded
{
$postMultipart = true;
}
}
unset($k, $v);
curl_setopt($ch, CURLOPT_POST, true);
if ($postMultipart)
{
curl_setopt($ch, CURLOPT_POSTFIELDS, $postFields);
}
else
{
curl_setopt($ch, CURLOPT_POSTFIELDS, substr($postBodyString,0,-1));
}
}
$reponse = curl_exec($ch);
//如果采集失败请用try{}catch(){}捕获
if (curl_errno($ch))
{
throw new Exception(curl_error($ch),0);
}
else
{
$httpStatusCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
//如果采集失败请用try{}catch(){}捕获
if (200 !== $httpStatusCode)
{
throw new Exception($reponse,$httpStatusCode);
}
}
curl_close($ch);
return $reponse;
}
//gzip解压函数，亲测
function _gzdecode($data)
{
$len = strlen($data);
if ($len < 18 || strcmp(substr($data,0,2),"\x1f\x8b"))
{
return $data; // 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 $data;
}
// 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 $data; // Invalid format
}
$extralen = unpack('v',substr($data,8,2));
$extralen = $extralen[1];
if($len - $headerlen - 2 - $extralen < 8)
{
return $data; // 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 $data; // Invalid format
}
$filenamelen = strpos(substr($data,8+$extralen),chr(0));
if($filenamelen === false || $len - $headerlen - $filenamelen - 1 < 8)
{
return $data; // 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 $data; // Invalid format
}
$commentlen = strpos(substr($data,8+$extralen+$filenamelen),chr(0));
if($commentlen === false || $len - $headerlen - $commentlen - 1 < 8)
{
return $data; // Invalid header format
}
$comment = substr($data,$headerlen,$commentlen);
$headerlen += $commentlen + 1;
}
$headercrc = '';
if($flags & 2)
{
// 2-bytes (lowest order) of CRC32 on header present
if ($len - $headerlen - 2 < 8)
{
return $data; // Invalid format
}
$calccrc = crc32(substr($data,0,$headerlen)) & 0xffff;
$headercrc = unpack('v', substr($data,$headerlen,2));
$headercrc = $headercrc[1];
if($headercrc != $calccrc)
{
return $data; // 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 $data;
}
$body = substr($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 $data;
}
}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 $data;
}
return $data;
};开启curl_setopt($ch, CURLOPT_ENCODING, 'gzip')
或者使用_gzdecode函数都不会对未经gzip压缩的数据产生影响，可以放心使用。
教程地址：http://blog.zhengshuiguang.com/php/http-gz.html
欢迎转载！但请带上文章地址^^
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