本文使用PHP解析Http协议
HTTP协议如下，包含两部分：请求头和请求体，我们主要是解析请求头，获取cookie，get，post等信息。
HTTP/1.1 200 OK Date: Sun, 25 Oct 2015 15:43:47 GMT Server: Apache Set-Cookie: PHPSESSID=4v2actjf96v614r2kh36380kq6; path=/ Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: private Pragma: no-cache Vary: Accept-Encoding Content-Length: 5105 Connection: close Content-Type: text/html; charset=utf-8 <html> .... </html>
分析可知,每一行是以 结束,http响应头header和响应体body是以 分割，下面通过正则表达式可以提取相关元素。
代码如下。
/**************测试结束****************************/
/*
* 函数: parse_http
* 描述: 解析http协议
*/
function parse_http($http)
{
// 初始化
$_POST = $_GET = $_COOKIE = $_REQUEST = $_SESSION = $_FILES = array();
$GLOBALS['HTTP_RAW_POST_DATA'] = '';
// 需要设置的变量名
$_SERVER = array (
'QUERY_STRING' => '',
'REQUEST_METHOD' => '',
'REQUEST_URI' => '',
'SERVER_PROTOCOL' => '',
'SERVER_SOFTWARE' => '',
'SERVER_NAME' => '',
'HTTP_HOST' => '',
'HTTP_USER_AGENT' => '',
'HTTP_ACCEPT' => '',
'HTTP_ACCEPT_LANGUAGE' => '',
'HTTP_ACCEPT_ENCODING' => '',
'HTTP_COOKIE' => '',
'HTTP_CONNECTION' => '',
'REMOTE_ADDR' => '',
'REMOTE_PORT' => '0',
);
// 将header分割成数组
list($http_header, $http_body) = explode("
", $http, 2);
$header_data = explode("
", $http_header);
list($_SERVER['REQUEST_METHOD'], $_SERVER['REQUEST_URI'], $_SERVER['SERVER_PROTOCOL']) = explode(' ', $header_data[0]);
unset($header_data[0]);
foreach($header_data as $content)
{
//
if(empty($content))
{
continue;
}
list($key, $value) = explode(':', $content, 2);
$key = strtolower($key);
$value = trim($value);
switch($key)
{
// HTTP_HOST
case 'host':
$_SERVER['HTTP_HOST'] = $value;
$tmp = explode(':', $value);
$_SERVER['SERVER_NAME'] = $tmp[0];
if(isset($tmp[1]))
{
$_SERVER['SERVER_PORT'] = $tmp[1];
}
break;
// cookie
case 'cookie':
$_SERVER['HTTP_COOKIE'] = $value;
parse_str(str_replace('; ', '&', $_SERVER['HTTP_COOKIE']), $_COOKIE);
break;
// user-agent
case 'user-agent':
$_SERVER['HTTP_USER_AGENT'] = $value;
break;
// accept
case 'accept':
$_SERVER['HTTP_ACCEPT'] = $value;
break;
// accept-language
case 'accept-language':
$_SERVER['HTTP_ACCEPT_LANGUAGE'] = $value;
break;
// accept-encoding
case 'accept-encoding':
$_SERVER['HTTP_ACCEPT_ENCODING'] = $value;
break;
// connection
case 'connection':
$_SERVER['HTTP_CONNECTION'] = $value;
break;
case 'referer':
$_SERVER['HTTP_REFERER'] = $value;
break;
case 'if-modified-since':
$_SERVER['HTTP_IF_MODIFIED_SINCE'] = $value;
break;
case 'if-none-match':
$_SERVER['HTTP_IF_NONE_MATCH'] = $value;
break;
case 'content-type':
if(!preg_match('/boundary="?(S+)"?/', $value, $match))
{
$_SERVER['CONTENT_TYPE'] = $value;
}
else
{
$_SERVER['CONTENT_TYPE'] = 'multipart/form-data';
$http_post_boundary = '--'.$match[1];
}
break;
}
}
// 需要解析$_POST
if($_SERVER['REQUEST_METHOD'] === 'POST')
{
if(isset($_SERVER['CONTENT_TYPE']) && $_SERVER['CONTENT_TYPE'] === 'multipart/form-data')
{
parse_upload_files($http_body, $http_post_boundary);
}
else
{
parse_str($http_body, $_POST);
// $GLOBALS['HTTP_RAW_POST_DATA']
$GLOBALS['HTTP_RAW_POST_DATA'] = $http_body;
}
}
// QUERY_STRING
$_SERVER['QUERY_STRING'] = parse_url($_SERVER['REQUEST_URI'], PHP_URL_QUERY);
if($_SERVER['QUERY_STRING'])
{
// $GET
parse_str($_SERVER['QUERY_STRING'], $_GET);
}
else
{
$_SERVER['QUERY_STRING'] = '';
}
// REQUEST
$_REQUEST = array_merge($_GET, $_POST);
return array('get'=>$_GET, 'post'=>$_POST, 'cookie'=>$_COOKIE, 'server'=>$_SERVER, 'files'=>$_FILES);
}
/*
* 函数: parse_upload_files
* 描述: 解析上传的文件
*/
function parse_upload_files($http_body, $http_post_boundary)
{
$http_body = substr($http_body, 0, strlen($http_body) - (strlen($http_post_boundary) + 4));
$boundary_data_array = explode($http_post_boundary."
", $http_body);
if($boundary_data_array[0] === '')
{
unset($boundary_data_array[0]);
}
foreach($boundary_data_array as $boundary_data_buffer)
{
list($boundary_header_buffer, $boundary_value) = explode("
", $boundary_data_buffer, 2);
// 去掉末尾
$boundary_value = substr($boundary_value, 0, -2);
foreach (explode("
", $boundary_header_buffer) as $item)
{
list($header_key, $header_value) = explode(": ", $item);
$header_key = strtolower($header_key);
switch ($header_key)
{
case "content-disposition":
// 是文件
if(preg_match('/name=".*?"; filename="(.*?)"$/', $header_value, $match))
{
$_FILES[] = array(
'file_name' => $match[1],
'file_data' => $boundary_value,
'file_size' => strlen($boundary_value),
);
continue;
}
// 是post field
else
{
// 收集post
if(preg_match('/name="(.*?)"$/', $header_value, $match))
{
$_POST[$match[1]] = $boundary_value;
}
}
break;
}
}
}
}
注意现在$_POST，$_GET，$_COOKIE，$_REQUEST，$_SESSION，$_FILES都是我们自己通过协议解析到的，而非PHP给我们提供的。
测试代码下：
$ch = curl_init(); curl_setopt($ch,CURLOPT_URL,'http://githubs.cn'); curl_setopt($ch,CURLOPT_HEADER,1); curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); curl_setopt($ch,CURLOPT_FOLLOWLOCATION,0); //抓取转跳 $output = curl_exec($ch); curl_close($ch); var_dump(parse_http($output));