php fsockopen模拟GET或POST请求

时间:2016-09-08
PHP关于socket编程的一个典型应用就是使用fsockopen模拟GET或POST提交,本文章向大家介绍php使用fsockopen函数发送post,get请求获取网页内容的方法,需要的朋友可以参考一下。

fsockopen是PHP提供的一个网络函数,用于打开打开一个网络连接或者一个Unix套接字连接。这是一种比较底层的写法,甚至fsockopen 返回的是没有处理过的数据,包括数据的长度数据内容和数据的结束符。而cURL系列函数就好用的多。CURL还会自动对DNS信息进行缓存,效率更高。偏底层的东西肯定更强大,学习成本更高。

使用fsockopen可以编写socket程序, fsockopen执行后返回的是文件指针,所以文件相关函数fgets()、fgetss()、fputs()、fclose() 与 feof(),尽情用吧,相信初学者,都会被它拼接http header恶心了吧。

下面向大家介绍fsockopen的基本语法:

resource fsockopen(string $hostname [,int $port = -1 [, int &$errno [,string &$errstr [, float $timeout = ini_get("default_socket_timeout") ]]]] )

启动一个套接字连接到指定的主机的资源,php支持在互联网领域的目标和unix在所支持的套接字传输列表说明,所支持的传输列表也可以检索使用stream_get_transports().

该插座预设会被启用,阻塞模式,你可以切换到非阻塞模式使用stream_set_blocking()。

 

1、fsockopen模拟GET:

$fp = fsockopen("www.manongjc.com", 80, $errno, $errstr, 30); 
 if (!$fp) { 
  echo "$errstr ($errno) "; 
 } else { 
  $out = "get / http/1.1 "; 
  $out .= "host: www.manongjc.com"; 
  $out .= "connection: close "; 
  fwrite($fp, $out); 
  while (!feof($fp)) { 
   echo fgets($fp, 128); 
  } 
  fclose($fp); 
 }

 

2、fsockopen模拟post:

$post =1; 
$url = parse_url($url); 
$host ='http://www.manongjc.com'; 
$path ='/'; 
$query ='?action=phpfensi.com'; 
$port =80; 
  
if($post) { 
  $out = "post $path http/1.0 "; 
  $out .= "accept: */* "; 
  //$out .= "referer: $boardurl "; 
  $out .= "accept-language: zh-cn "; 
  $out .= "content-type: application/x-www-form-urlencoded "; 
  $out .= "user-agent: $_server[http_user_agent] "; 
  $out .= "host: $host "; 
  $out .= 'content-length: '.strlen($post)." "; 
  $out .= "connection: close "; 
  $out .= "cache-control: no-cache "; 
  $out .= "cookie: $cookie "; 
  $out .= $post; 
 } else { 
  $out = "get $path http/1.0 "; 
  $out .= "accept: */* "; 
  //$out .= "referer: $boardurl "; 
  $out .= "accept-language: zh-cn "; 
  $out .= "user-agent: $_server[http_user_agent] "; 
  $out .= "host: $host "; 
  $out .= "connection: close "; 
  $out .= "cookie: $cookie "; 
 } 
 $fp = @fsockopen(($ip ? $ip : $host), $port, $errno, $errstr, $timeout); 
 if(!$fp)  
 { 
  return '';//note $errstr : $errno  
 } else { 
  return '成功访问'; 
 }

 

3、封装好的fsockopen函数实现POST、GET请求

function http_request($url, $method = 'GET', $postfields = NULL, $headers = array()) {
 
    $parse = parse_url($url);
 
    isset($parse['host']) ||$parse['host'] = '';
    isset($parse['path']) || $parse['path'] = '';
    isset($parse['query']) || $parse['query'] = '';
    isset($parse['port']) || $parse['port'] = '';
 
    $path = $parse['path'] ? $parse['path'].($parse['query'] ? '?'.$parse['query'] : '') : '/';
    $host = $parse['host'];
 
    //协议
    if ($parse['scheme'] == 'https') {
        $version = '1.1';
        $port = empty($parse['port']) ? 443 : $parse['port'];
        $host = 'ssl://'.$host;
    } else {
        $version = '1.0';
        $port = empty($parse['port']) ? 80 : $parse['port'];
    }
 
    //Headers
    $headers[] = "Host: {$parse['host']}";
    $headers[] = 'Connection: Close';
    $headers[] = "User-Agent: $_SERVER[HTTP_USER_AGENT]";  
    $headers[] = 'Accept: */*';
 
    //包体信息
    if ($method == 'POST') {
        if(is_array($postfields)){
            $postfields = http_build_query($postfields);
        }
        $headers[] = "Content-type: application/x-www-form-urlencoded";
        $headers[] = 'Content-Length: '.strlen($postfields);
        $out = "POST $path HTTP/$version\r\n".join("\r\n", $headers)."\r\n\r\n".$postfields;
    } else {
        $out = "GET $path HTTP/$version\r\n".join("\r\n", $headers)."\r\n\r\n";
    }
 
    //发送请求
    $limit = 0;
    $fp = fsockopen($host, $port, $errno, $errstr, 30);
 
    if (!$fp) {
        exit('Failed to establish socket connection: '.$url);
    } else {
        $header = $content = '';
        //集阻塞/非阻塞模式流,$block==true则应用流模式
        stream_set_blocking($fp, true);
         //设置流的超时时间
        stream_set_timeout($fp, 30);
        fwrite($fp, $out);
        //从封装协议文件指针中取得报头/元数据
        $status = stream_get_meta_data($fp);
 
        if (!$status['timed_out']) { //未超时
            while (!feof($fp)) {
                $header .= $h = fgets($fp);
                if ($h && ($h == "\r\n" ||  $h == "\n")) break;
                if (strpos($h, 'Content-Length:') !== false) {
                    $limit = intval(substr($header, 15));
                }
            }
 
            $stop = false;
            while (!feof($fp) && !$stop) {
                $data = fread($fp, ($limit == 0 || $limit > 8192 ? 8192 : $limit));
                $content .= $data;
                if ($limit) {
                    $limit -= strlen($data);
                    $stop = $limit <= 0;
                }
            }
        }
        fclose($fp);
 
        //unchunk
        $content = preg_replace_callback(
            '/(?:(?:\r\n|\n)|^)([0-9A-F]+)(?:\r\n|\n){1,2}(.*?)'.
            '((?:\r\n|\n)(?:[0-9A-F]+(?:\r\n|\n))|$)/si',
            create_function(
                '$matches',
                'return hexdec($matches[1]) == strlen($matches[2]) ? $matches[2] : $matches[0];'
            ),
            $content
        );
 
        return $content;
    }
}

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原文地址:http://www.manongjc.com/article/1465.html