早就习惯了使用XmlHttpRequest来执行HTTP请求，虽然PHP自带的file类函数支持HTTP读取，但是不能自定义HTTP头是一个大问题。所以我就仿造MSXML2.XMLHTTP组件用socket封装了一个XmlHttpRequest类，虽然很简单，但是很方便~不敢独享，放出来给需要的朋友。

    使用方法请见MSDN的参考，在此不在赘述。和MSXML2.XMLHTTP组件不同的地方就是获取相应只有responseContent属性可用。

    代码如下：
[codesyntax lang=”php”]
/*
*XmlHttpRequest类
*By 枫行天下 starlight36@163.com
*Http://www.msphome.cn
*Ver 1.0 2009-11-15
*/
class XmlHttpRequest {
  public $responseContent;
  public $readyState = 0;
  public $status;
  public $statusText;
  private $fp;
  private $arrHeaders;
  private $responseAll;

  public function getAllResponseHeaders() {
    if ($this->readyState != 4) return NULL;
    $arrResponse = explode(“\r\n\r\n”, $this->responseAll);
    return $arrResponse[0];
  }
  public function getResponseHeader($bstrHeader) {
    if ($this->readyState != 4) return;
    preg_match_all(“/{$bstrHeader}: (.+)/i”, $this->responseAll, $arrResponse);
    return $arrResponse[1];
  }
  public function setRequestHeader($sName, $sValue) {
    if ($this->readyState != 1) return;
    $this->arrHeaders[] = $sName.”: “.$sValue;
  }
  public function open($sMethod, $sUrl) {
    $arrUrl = parse_url($sUrl);
    $arrUrl[‘port’] = isset($arrUrl[‘port’])? $arrUrl[‘port’] : 80;
    $arrUrl[‘path’] = isset($arrUrl[‘path’])? $arrUrl[‘path’] : “/”;
    $sScheme = (strtolower($arrUrl[‘scheme’]) == “https”) ? “ssl://” : NULL;
    $sMethod = (strtolower($sMethod) == “post”) ? “POST” : “GET”;
    $sUrl = isset($arrUrl[‘query’]) ? “?”.$arrUrl[‘query’] : NULL;
    $sUrl = $arrUrl[‘path’].$sUrl;
    $this->fp = fsockopen($sScheme.$arrUrl[‘host’], $arrUrl[‘port’], $errno, $errstr, 180);
    if (!$this->fp) {
      $this->readyState = 0;
      $this->status = $errno;
      $this->statusText = $errstr;
    }else{
      $this->readyState = 1;
      $this->arrHeaders[] = $sMethod.” “.$sUrl.” HTTP/1.1″;
      $this->setRequestHeader(“Accept”, “*/*”);
      $this->setRequestHeader(“Host”, $arrUrl[‘host’]);
    }
  }
  public function send($varBody = NULL) {
    if ($this->readyState != 1) return;
    if ($varBody != NULL) $this->setRequestHeader(“Content-Length”, strlen($varBody));
    $this->setRequestHeader(“Connection”, “Close\r\n\r\n”);
    $strHeader = implode(“\r\n”, $this->arrHeaders);
    if ($varBody != NULL) $strHeader .= $varBody.”\r\n”;
    $this->readyState = 2;
    fwrite($this->fp, $strHeader);
    $this->readyState = 3;
    while (!feof($this->fp)) {
      $this->responseAll .= fgets($this->fp, 512);
    }
    fclose($this->fp);
    $arrResponse = explode(“\r\n”, $this->responseAll);
    $this->status = substr($arrResponse[0], 9, 3);
    $content = substr($this->responseAll, strpos($this->responseAll, “\r\n\r\n”) + 4);
    if ($this->status >= 400) {
      $this->statusText = $content;
    }else{
      $this->responseContent = $content;
    }
    $this->readyState = 4;
  }
}
[/codesyntax]