PHP实现简单的GET、POST、Cookie、Session等功能

<?php 
/* 
 * Filename: httpclient.php 
 * Created on 2012-12-21 
 * Created by RobinTang 
 * To change the template for this generated file go to 
 * Window - Preferences - PHPeclipse - PHP - Code Templates 
 */ 
class SinCookie { 
  public $name; // Cookie名称 
  public $value; // Cookie值 
  // 下面三个属性现在未实现 
  public $expires; // 过期时间 
  public $path; // 路径 
  public $domain; // 域 
  // 从Cookie字符串创建一个Cookie对象 
  function __construct($s = false) { 
    if ($s) { 
      $i1 = strpos($s, &#39;=&#39;); 
      $i2 = strpos($s, &#39;;&#39;); 
      $this->name = trim(substr($s, 0, $i1)); 
      $this->value = trim(substr($s, $i1 +1, $i2 - $i1 -1)); 
    } 
  } 
  // 获取Cookie键值对 
  function getKeyValue() { 
    return "$this->name=$this->value"; 
  } 
} 
// 会话上下文 
class SinHttpContext { 
  public $cookies; // 会话Cookies 
  public $referer; // 前一个页面地址 
  function __construct() { 
    $this->cookies = array (); 
    $this->refrer = ""; 
  } 
  // 设置Cookie 
  function cookie($key, $val) { 
    $ck = new SinCookie(); 
    $ck->name = $key; 
    $ck->value = $val; 
    $this->addCookie($ck); 
  } 
  // 添加Cookie 
  function addCookie($ck) { 
    $this->cookies[$ck->name] = $ck; 
  } 
  // 获取Cookies字串，请求时用到 
  function cookiesString() { 
    $res = &#39;&#39;; 
    foreach ($this->cookies as $ck) { 
      $res .= $ck->getKeyValue() . &#39;;&#39;; 
    } 
    return $res; 
  } 
} 
// Http请求对象 
class SinHttpRequest { 
  public $url; // 请求地址 
  public $method = &#39;GET&#39;; // 请求方法 
  public $host; // 主机 
  public $path; // 路径 
  public $scheme; // 协议，http 
  public $port; // 端口 
  public $header; // 请求头 
  public $body; // 请求正文 
  // 设置头 
  function setHeader($k, $v) { 
    if (!isset ($this->header)) { 
      $this->header = array (); 
    } 
    $this->header[$k] = $v; 
  } 
  // 获取请求字符串 
  // 包含头和请求正文 
  // 获取之后直接写socket就行 
  function reqString() { 
    $matches = parse_url($this->url); 
    !isset ($matches[&#39;host&#39;]) && $matches[&#39;host&#39;] = &#39;&#39;; 
    !isset ($matches[&#39;path&#39;]) && $matches[&#39;path&#39;] = &#39;&#39;; 
    !isset ($matches[&#39;query&#39;]) && $matches[&#39;query&#39;] = &#39;&#39;; 
    !isset ($matches[&#39;port&#39;]) && $matches[&#39;port&#39;] = &#39;&#39;; 
    $host = $matches[&#39;host&#39;]; 
    $path = $matches[&#39;path&#39;] ? $matches[&#39;path&#39;] . ($matches[&#39;query&#39;] ? &#39;?&#39; . $matches[&#39;query&#39;] : &#39;&#39;) : &#39;/&#39;; 
    $port = !empty ($matches[&#39;port&#39;]) ? $matches[&#39;port&#39;] : 80; 
    $scheme = $matches[&#39;scheme&#39;] ? $matches[&#39;scheme&#39;] : &#39;http&#39;; 
    $this->host = $host; 
    $this->path = $path; 
    $this->scheme = $scheme; 
    $this->port = $port; 
    $method = strtoupper($this->method); 
    $res = "$method $path HTTP/1.1\r\n"; 
    $res .= "Host: $host\r\n"; 
    if ($this->header) { 
      reset($this->header); 
      while (list ($k, $v) = each($this->header)) { 
        if (isset ($v) && strlen($v) > 0) 
          $res .= "$k: $v\r\n"; 
      } 
    } 
    $res .= "\r\n"; 
    if ($this->body) { 
      $res .= $this->body; 
      $res .= "\r\n\r\n"; 
    } 
    return $res; 
  } 
} 
// Http响应 
class SinHttpResponse { 
  public $scheme; // 协议 
  public $stasus; // 状态，成功的时候是ok 
  public $code; // 状态码，成功的时候是200 
  public $header; // 响应头 
  public $body; // 响应正文 
  function __construct() { 
    $this->header = array (); 
    $this->body = null; 
  } 
  function setHeader($key, $val) { 
    $this->header[$key] = $val; 
  } 
} 
// HttpClient 
class SinHttpClient { 
  public $keepcontext = true; // 是否维持会话 
  public $context; // 上下文 
  public $request; // 请求 
  public $response; // 响应 
  public $debug = false;
  // 是否在Debug模式，
  //为true的时候会打印出请求内容和相同的头部 
  function __construct() { 
    $this->request = new SinHttpRequest(); 
    $this->response = new SinHttpResponse(); 
    $this->context = new SinHttpContext(); 
    $this->timeout = 15; // 默认的超时为15s 
  } 
  // 清除上一次的请求内容 
  function clearRequest() { 
    $this->request->body = &#39;&#39;; 
    $this->request->setHeader(&#39;Content-Length&#39;, false); 
    $this->request->setHeader(&#39;Content-Type&#39;, false); 
  } 
  // post方法 
  // data为请求的数据 
  // 为键值对的时候模拟表单提交 
  // 其他时候为数据提交，提交的形式为xml 
  // 如有其他需求，请自行扩展 
  function post($url, $data = false) { 
    $this->clearRequest(); 
    if ($data) { 
      if (is_array($data)) { 
        $con = http_build_query($data); 
        $this->request->setHeader(&#39;Content-Type&#39;, &#39;application/x-www-form-urlencoded&#39;); 
      } else { 
        $con = $data; 
        $this->request->setHeader(&#39;Content-Type&#39;, &#39;text/xml; charset=utf-8&#39;); 
      } 
      $this->request->body = $con; 
      $this->request->method = "POST"; 
      $this->request->setHeader(&#39;Content-Length&#39;, strlen($con)); 
    } 
    $this->startRequest($url); 
  } 
  // get方法 
  function get($url) { 
    $this->clearRequest(); 
    $this->request->method = "GET"; 
    $this->startRequest($url); 
  } 
  // 该方法为内部调用方法，不用直接调用 
  function startRequest($url) { 
    $this->request->url = $url; 
    if ($this->keepcontext) { 
      // 如果保存上下文的话设置相关信息 
      $this->request->setHeader(&#39;Referer&#39;, $this->context->refrer); 
      $cks = $this->context->cookiesString(); 
      if (strlen($cks) > 0) 
        $this->request->setHeader(&#39;Cookie&#39;, $cks); 
    } 
    // 获取请求内容 
    $reqstring = $this->request->reqString(); 
    if ($this->debug) 
      echo "Request:\n$reqstring\n"; 
    try { 
      $fp = fsockopen($this->request->host, $this->request->port, $errno, $errstr, $this->timeout); 
    } catch (Exception $ex) { 
      echo $ex->getMessage(); 
      exit (0); 
    } 
    if ($fp) { 
      stream_set_blocking($fp, true); 
      stream_set_timeout($fp, $this->timeout); 
      // 写数据 
      fwrite($fp, $reqstring); 
      $status = stream_get_meta_data($fp); 
      if (!$status[&#39;timed_out&#39;]) { //未超时 
        // 下面的循环用来读取响应头部 
        while (!feof($fp)) { 
          $h = fgets($fp); 
          if ($this->debug) 
            echo $h; 
          if ($h && ($h == "\r\n" || $h == "\n")) 
            break; 
          $pos = strpos($h, &#39;:&#39;); 
          if ($pos) { 
            $k = strtolower(trim(substr($h, 0, $pos))); 
            $v = trim(substr($h, $pos +1)); 
            if ($k == &#39;set-cookie&#39;) { 
              // 更新Cookie 
              if ($this->keepcontext) { 
                $this->context->addCookie(new SinCookie($v)); 
              } 
            } else { 
              // 添加到头里面去 
              $this->response->setHeader($k, $v); 
            } 
          } else { 
            // 第一行数据 
            // 解析响应状态 
            $preg = &#39;/^(\S*) (\S*) (.*)$/&#39;; 
            preg_match_all($preg, $h, $arr); 
            isset ($arr[1][0]) & $this->response->scheme = trim($arr[1][0]); 
            isset ($arr[2][0]) & $this->response->stasus = trim($arr[2][0]); 
            isset ($arr[3][0]) & $this->response->code = trim($arr[3][0]); 
          } 
        } 
        // 获取响应正文长度 
        $len = (int) $this->response->header[&#39;content-length&#39;]; 
        $res = &#39;&#39;; 
        // 下面的循环读取正文 
        while (!feof($fp) && $len > 0) { 
          $c = fread($fp, $len); 
          $res .= $c; 
          $len -= strlen($c); 
        } 
        $this->response->body = $res; 
      } 
      // 关闭Socket 
      fclose($fp); 
      // 把返回保存到上下文维持中 
      $this->context->refrer = $url; 
    } 
  } 
} 
// demo 
// now let begin test it 
$client = new SinHttpClient(); // create a client 
$client->get(&#39;http://www.baidu.com/&#39;);  // get 
echo $client->response->body; // echo 
?>