php利用socket函数模拟发送http请求

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<?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();?>
from http://blog.csdn.net/kankan231/article/details/8510845
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