用PHP的Socket实现HTTP请求[作者:karajanlee](客户端)

要实现HTTP访问无非就是用Socket发送一个请求，然后读取返回信息。于是我就用Socket写了一个HttpRequest的类，当然也可以用fsockopen()这个函数来实现，不过两个的区别不是很大，具体代码在附件里，自己看咯。

<?php
 /**
  * Network: HTTP request object
  * Author: Li HouYu (Karajan Lee), Shanghai, China.
  */
 
 class HttpRequest
 {
  var $sHostAdd;
  var $sUri;
  var $iPort;
  
  var $sRequestHeader;
  
  var $sResponse;
  
  function HttpRequest($sUrl)
  {
   $sPatternUrlPart = '/http:\/\/([a-z-\.0-9]+)(:(\d+)){0,1}(.*)/i';
   $arMatchUrlPart = array();
   preg_match($sPatternUrlPart, $sUrl, $arMatchUrlPart);
   
   $this->sHostAdd = gethostbyname($arMatchUrlPart[1]);
   if (empty($arMatchUrlPart[4]))
   {
    $this->sUri = '/';
   }
   else
   {
    $this->sUri = $arMatchUrlPart[4];
   }
   if (empty($arMatchUrlPart[3]))
   {
    $this->iPort = 80;
   }
   else
   {
    $this->iPort = $arMatchUrlPart[3];
   }
   
   $this->addRequestHeader('Host: '.$arMatchUrlPart[1]);
   $this->addRequestHeader('Connection: Close');
  }
  
  function addRequestHeader($sHeader)
  {
   $this->sRequestHeader .= trim($sHeader)."\r\n";
  }
  
  function sendRequest($sMethod = 'GET', $sPostData = '')
  {
   $sRequest = $sMethod." ".$this->sUri." HTTP/1.1\r\n";
   $sRequest .= $this->sRequestHeader;
   if ($sMethod == 'POST')
   {
    $sRequest .= "Content-Type: application/x-www-form-urlencoded\r\n";
    $sRequest .= "Content-Length: ".strlen($sPostData)."\r\n";
    $sRequest .= "\r\n";
    $sRequest .= $sPostData."\r\n";
   }
   $sRequest .= "\r\n";
   
   $sockHttp = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
   if (!$sockHttp)
   {
    die('socket_create() failed!');
   }
   
   $resSockHttp = socket_connect($sockHttp, $this->sHostAdd, $this->iPort);
   if (!$resSockHttp)
   {
    die('socket_connect() failed!');
   }
   
   socket_write($sockHttp, $sRequest, strlen($sRequest));
   
   $this->sResponse = '';
   while ($sRead = socket_read($sockHttp, 4096))
   {
    $this->sResponse .= $sRead;
   }
   
   socket_close($sockHttp);
  }
  
  function getResponse()
  {
   return $this->sResponse;
  }
  
  function getResponseBody()
  {
   $sPatternSeperate = '/\r\n\r\n/';
   $arMatchResponsePart = preg_split($sPatternSeperate, $this->sResponse, 2);
   return $arMatchResponsePart[1];
  }
  
  function getResponseHead()
  {
   $sPatternSeperate = '/\r\n\r\n/';
   $arMatchResponsePart = preg_split($sPatternSeperate, $this->sResponse, 2);
   return $arMatchResponsePart[0];
  }
 }
 ?>