php利用socket函数模拟发送http请求

<?php

/*
* Network: HTTP request object* Author: Li HouYu (Karajan Lee), Shanghai, China.
*/
class HttpRequest{
		  private $sHostAdd;//服务器ip
		  private $sUri;//请求的文件
		  private $iPort;//服务器端口
		  private $sRequestHeader;//请求头信息
		  private $sResponse;//请求信息
		
		//构造函数
	  function __construct($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');
	  }
	  
	  
	  //添加头信息
	  function addRequestHeader($sHeader){
	 	 $this->sRequestHeader .= trim($sHeader)."\r\n";
	  }
	  
	  //发送请求
	  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);
	  }
	  
	  //获取响应
	  function getResponse(){
	  	return $this->sResponse;
	  }
	  
	  //获取响应正文
	  function getResponseBody(){
		  $sPatternSeperate = '/\r\n\r\n/';
		  $arMatchResponsePart = preg_split($sPatternSeperate, $this->sResponse, 2);
		  return $arMatchResponsePart[1];
	  }
	  
	  //获取响应头
	  function getResponseHead(){
		  $sPatternSeperate = '/\r\n\r\n/';
		  $arMatchResponsePart = preg_split($sPatternSeperate, $this->sResponse, 2);
		  return $arMatchResponsePart[0];
	  }
}


$url='http://www.baidu.com';
$httpRequest=new HttpRequest($url);
$httpRequest->sendRequest();
file_put_contents('temp.txt',$httpRequest->getResponse());
echo $httpRequest->getResponseBody();



?>