PHP Parsing HTTP protocol

This article uses PHP to parse the HTTP protocol

The HTTP protocol consists of two parts: the request header and the request body, and we mainly parse the request header to obtain cookie,get,post information.

http/1.1 Okdate:sun, Oct 15:43:47 gmtserver:apacheset-cookie:phpsessid=4v2actjf96v614r2kh36380kq6; Path=/expires:thu, 1981 08:52:00 Gmtcache-control:privatepragma:no-cachevary:accept-encodingcontent-length: 5105connection:closecontent-type:text/html; Charset=utf-8
　　
The analysis shows that each line is ended with \ r \ n, the HTTP response header header and the response body body are split with \r\n\r\n, and the relevant elements can be extracted by regular expressions below.
The code is as follows.
/************** Test End ****************************//** Function: parse_http* Description: Parsing http protocol */function parse_http ($http) {        Initialize $_post = $_get = $_cookie = $_request = $_session = $_files = Array ();        $GLOBALS [' http_raw_post_data '] = ';              The variable name that needs to be set $_server = Array (' query_string ' = = ', ' request_method ' = ' = ',              ' Request_uri ' = ' ', ' server_protocol ' = ', ' and ' server_software ' and ', ' ' server_name ' = ' ', ' http_host ' = ', ' and ', ' http_user_agent ' and ', ' HTT              P_accept ' + ' ', ' http_accept_language ' = ', ', ' http_accept_encoding ' and ', ' ' Http_cookie ' + ' ', ' http_connection ' = ', ', ' remote_addr ' + ', ' REM                Ote_port ' = ' 0 ',); Divide the header into the array list ($http _header, $http _body) = Explode ("\r\n\r\n", $httP, 2);                $header _data = Explode ("\ r \ n", $http _header); List ($_server[' Request_method '), $_server[' Request_uri '], $_server[' server_protocol ']) = Explode (", $header _data[0                ]);        Unset ($header _data[0]);                foreach ($header _data as $content) {//\r\n\r\n if (empty ($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; }}//need to parse $_post if ($_server[' request_method ' = = = = ' POST ') {if (Isset ($_se rver[' Content_Type ') && $_server[' content_type '] = = = ' Multipart/form-data ') {PARSE_UPL Oad_files ($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_que        RY);        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) ; }/** function: parse_upload_files* Description: Parse the uploaded file */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. "        \ r \ n ", $http _body);        if ($boundary _data_array[0] = = = ") {unset ($boundary _data_array[0]); } foreach ($boundary _data_array as $boundary _data_buffer) {list ($boundary _header_buffer, $boundar            Y_value) = explode ("\r\n\r\n", $boundary _data_buffer, 2);            Remove the end \ r \ n $boundary _value = substr ($boundary _value, 0,-2);  foreach (Explode ("\ r \ n", $boundary _header_buffer) as $item) {list ($header _key, $header _value) =                Explode (":", $item);                $header _key = strtolower ($header _key);                        Switch ($header _key) {case "content-disposition"://Is File if (Preg_match ('/name= ". *?); Filename= "(. *?)"                                $/', $header _value, $match)) {$_files[] = array ( ' file_name ' = $match [1], 'File_data ' = $boundary _value, ' file_size ' and strlen ($boundary _value),                            );                        Continue  }//Is post field else {// Collect post if ('/name= ' (. *?) "Preg_match $/', $header _value, $match)) {$_post[$match [1]] = $boundary _val                            Ue                }} break; }            }        }}
Note that the $_post,$_get,$_cookie,$_request,$_session,$_files are now resolved by our own protocol, not by PHP.
Under test code:
$ch = Curl_init (); curl_setopt ($ch, Curlopt_url, ' http://githubs.cn '); curl_setopt ($ch, curlopt_header,1); curl_setopt ($ch, curlopt_returntransfer,1); curl_setopt ($ch, curlopt_followlocation,0);//grab Jump $output = Curl_ EXEC ($ch); Curl_close ($ch); Var_dump (Parse_http ($output));    
PHP Parsing HTTP protocol