用PHP的Socket实现HTTP请求

最近HTTP远程访问的程序写得多了，主要接触的是.NET类库里的WebHttpRequest类和Microsoft.XMLHTTP这个通用的对象，有了这些方便的类，我们可以通过C#，ASP，Javascript来模拟Web客户端访问其他的Web页面。但是今天想用PHP实现一下类似的功能，却一时找不到方向了，于是只能自己“丰衣足食”了。

目前，PHP里面还没有类似于HttpRequest的类，不过在官方在线文档中找到了这么一个HttpRequest Class的页面，不过也只是提及了此功能目前可能只有在CVS版本中存在，无奈...

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];
}
}
?>