php+socket模拟表单发送请求

 <?php
 /**
  * http请求类(php + socket)
  * @todo 这里还有很多未完善的地方，仅有简单的get post head请求
  * @author chuangrain@gmail.com
  * @version 1.0.0
  */  

 class HttpClient {  

     const CRLF = "\r\n";
     private $fh = null;       //socket handle
     private $errno = -1;      //socket open error no
     private $errstr = '';     //socket open error message
     private $timeout = 30;    //socket open timeout
     private $line = array();  //request line
     private $header = array();//request header
     private $body = array();  //request body
     private $url = array();   //request url
     private $response = '';   //response
     private $version = '1.1'; //http version  

     public function __construct() {  

     }  

     /**
      * 发送HTTP get请求
      * @access public
      * @param string $url 请求的url
      */
     public function get($url = '') {
         $this->setUrl($url);
         $this->setLine();
         $this->setHeader();
         $this->request();
         return $this->response;
     }  

     /**
      * 发送HTTP post请求
      * @access public
      */
     public function post() {
         $this->setLine('POST');
         $this->request();
         return $this->response;
     }  

     /**
      * HTTP -> HEAD 方法，取得服务器响应一个 HTTP 请求所发送的所有标头
      * @access public
      * @param string $url 请求的url
      * @param int $fmt 数据返回形式，关联数组与普通数组
      * @return array 返回响应头信息
      */
     public function head($url = '', $fmt = 0) {
         $headers = null;
         if (is_string($url)) {
             $headers = get_headers($url, $fmt);
         }
         return $headers;
     }  

     /**
      * 设置要请求的 url
      * @todo 这里未做url验证
      * @access public
      * @param string $url request url
      * @return bool
      */
     public function setUrl($url = '') {
         if (is_string($url)) {
             $this->url = parse_url($url);
             if (!isset($this->url['port'])) {//设置端口
                 $this->url['port'] = 80;
             }
         } else {
             return false;
         }
     }  

     /**
      * 设置HTTP协议的版本
      * @access public
      * @param string $version HTTP版本，default value = 1.1
      * @return bool 如果不在范围内返回false
      */
     public function setVersion($version = "1.1") {
         if ($version == '1.1' || $version == '1.0' || $version == '0.9') {
             $this->version = $version;
         } else {
             return false;
         }
     }  

     /**
      * 设置HTTP请求行
      * @access public
      * @param string $method 请求方式 default value = GET
      */
     private function setLine($method = "GET") {
         //请求空：Method URI HttpVersion
         if (isset($this->url['query'])) {
             $this->line[0] = $method . " " . $this->url['path'] . "?" . $this->url['query'] . " HTTP/" . $this->version;
         } else {
             $this->line[0] = $method . " " . $this->url['path'] . " HTTP/" . $this->version;
         }
     }  

     /**
      * 设置HTTP请求头信息
      * @access public
      * @param array $header 请求头信息
      */
     public function setHeader($header = null) {
         $this->header[0] = "Host: " . $this->url['host'];
         if (is_array($header)) {
             foreach($header as $k => $v) {
                 $this->setHeaderKeyValue($k, $v);
             }
         }
     }  

     /**
      * HTTP请求主体
      * @access public
      * @param array $body 请求主体
      */
     public function setBody($body = null) {
         if (is_array($body)) {
             foreach ($body as $k => $v) {
                 $this->setBodyKeyValue($k, $v);
             }
         }
     }  

     /**
      * 单条设置HTTP请求主体
      * @access public
      * @param string $key 请求主体的键
      * @param string $value 请求主体的值
      */
     public function setBodyKeyValue($key, $value) {
         if (is_string($key)) {
             $this->body[] = $key . "=" . $value;
         }
     }  

     /**
      * 单条设置HTTP请求头信息
      * @access public
      * @param string $key 请求头信息的键
      * @param string $value 请求头信息的键
      */
     public function setHeaderKeyValue($key, $value) {
         if (is_string($key)) {
             $this->header[] = $key . ": " . $value;
         }
     }  

     /**
      * socket连接host, 发送请求
      * @access private
      */
     private function request() {
         //构造http请求
         if (!empty($this->body)) {
             $bodyStr = implode("&", $this->body);
             $this->setHeaderKeyValue("Content-Length", strlen($bodyStr));
             $this->body[] = $bodyStr;
             $req = array_merge($this->line, $this->header, array(""), array($bodyStr), array(""));
         } else {
             $req = array_merge($this->line, $this->header, array(""), $this->body, array(""));
         }
         $req = implode(self::CRLF, $req);  

         //socket连接host
         $this->fh = fsockopen($this->url['host'], $this->url['port'], $this->errno, $this->errstr, $this->timeout);  

         if (!$this->fh) {
             echo "socket connect fail!";
             return false;
         }  

         //写请求
         fwrite($this->fh, $req);  

         //读响应
         while (!feof($this->fh)) {
             $this->response .= fread($this->fh, 1024);
         }
     }  

     /**
      * 关闭socket连接
      * @access public
      */
     public function __destruct() {
         if ($this->fh) {
             fclose($this->fh);
         }
     }  

 }  

 $url = "http://localhost/xdebug/post_test.php";  

 /** get test **/
 $http1 = new HttpClient();
 var_dump($http1->get($url));  

 /** post test **/
 $http2 = new HttpClient();
 $header = array(
     "Content-Type" => "application/x-www-form-urlencoded"
 );
 $body = array(
     "username" => "1234",
     "submit" => "Login"
 );
 $http2->setUrl($url);
 $http2->setHeader($header);
 $http2->setBody($body);
 var_dump($http2->post());  

 /** head test **/
 $http3 = new HttpClient();
 var_dump($http3->head($url, 1));
 post_test.php code list
 [php] view plaincopyprint?
 <?php  

 var_dump($_POST);  

 ?>  

 <!DOCTYPE html>
 <html>
     <head>
         <title>post request test</title>
     </head>
     <body>
         <form action="" method="post">
             <input type="text" name="username">
             <input type="submit" name="submit" value="Login">
         </form>
     </body>
 </html>