PHP实现简单的GET、POST、Cookie、Session等功能

本篇文章主要介绍PHP实现简单的GET、POST、Cookie、Session等功能，感兴趣的朋友参考下，希望对大家有所帮助。

本文实例讲述了PHP封装的HttpClient类，具体分析如下：

这是一段php封装的HttpClient类，可实现GET POST Cookie Session等简单的功能。原来做过，这两天重新修改了一下。

<?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
?>

总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。

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