php 利用socket发送HTTP请求（GET，POST）

<request-line>
<headers>
<blank line>
[<request-body>]

<status-line>
<headers>
<blank line>
[<response-body>]

<?php 
interface Proto {
  // 连接url
  function conn($url);
  //发送get查询
  function get();
  // 发送post查询
  function post();
  // 关闭连接
  function close();
}
class Http implements Proto {
  const CRLF = "\r\n";
  protected $errno = -1;
  protected $errstr = '';
  protected $response = '';
  protected $url = null;
  protected $version = 'HTTP/1.1';
  protected $fh = null;
  protected $line = array();
  protected $header = array();
  protected $body = array();
  public function __construct($url) {
    $this->conn($url);
    $this->setHeader('Host: ' . $this->url['host']);
  }
  // 此方法负责写请求行
  protected function setLine($method) {
    $this->line[0] = $method . ' ' . $this->url['path'] . '?' .$this->url['query'] . ' '. $this->version;
  }
  // 此方法负责写头信息
  public function setHeader($headerline) {
    $this->header[] = $headerline; 
  }
  // 此方法负责写主体信息
  protected function setBody($body) {
     $this->body[] = http_build_query($body);
  }
  // 连接url
  public function conn($url) {
    $this->url = parse_url($url);
    //　判断端口
    if(!isset($this->url['port'])) {
      $this->url['port'] = 80;
    }
    //　判断query
    if(!isset($this->url['query'])) {
      $this->url['query'] = '';
    }
    $this->fh = fsockopen($this->url['host'],$this->url['port'],$this->errno,$this->errstr,3);
  }
  //构造get请求的数据
  public function get() {
    $this->setLine('GET');
    $this->request();
    return $this->response;
  }
  // 构造post查询的数据
  public function post($body = array()) {   
    $this->setLine('POST');
    // 设计content-type
    $this->setHeader('Content-type: application/x-www-form-urlencoded');
    // 设计主体信息,比GET不一样的地方
    $this->setBody($body);
    // 计算content-length
    $this->setHeader('Content-length: ' . strlen($this->body[0]));
    $this->request();
    return $this->response;
  }
  // 真正请求
  public function request() {
    // 把请求行，头信息，实体信息　放在一个数组里，便于拼接
    $req = array_merge($this->line,$this->header,array(''),$this->body,array(''));
    //print_r($req);
    $req = implode(self::CRLF,$req); 
    //echo $req; exit;
    fwrite($this->fh,$req);
    while(!feof($this->fh)) {
      $this->response .= fread($this->fh,1024);
    }
    $this->close(); //　关闭连接
  }
  // 关闭连接
  public function close() {
    fclose($this->fh);
  }
}

<?php
//记得引用Http类
$url="http://home.jb51.net/u/DeanChopper/";
$http=new Http($url);
$response=$http->get();
print_r($response);

<?php
/**
 * 使用PHP Socket 编程模拟Http post和get请求
 * @author koma
 */
class Http{
  private $sp = "\r\n"; //这里必须要写成双引号
  private $protocol = 'HTTP/1.1';
  private $requestLine = "";
  private $requestHeader = "";
  private $requestBody = "";
  private $requestInfo = "";
  private $fp = null;
  private $urlinfo = null;
  private $header = array();
  private $body = "";
  private $responseInfo = "";
  private static $http = null; //Http对象单例
   
  private function __construct() {}
   
  public static function create() {
    if ( self::$http === null ) { 
      self::$http = new Http();
    }
    return self::$http;
  }
   
  public function init($url) {
    $this->parseurl($url);
    $this->header['Host'] = $this->urlinfo['host'];
    return $this;
  }
   
  public function get($header = array()) {
    $this->header = array_merge($this->header, $header);
    return $this->request('GET');
  }
   
  public function post($header = array(), $body = array()) {
    $this->header = array_merge($this->header, $header);
    if ( !empty($body) ) {
      $this->body = http_build_query($body);
      $this->header['Content-Type'] = 'application/x-www-form-urlencoded';
      $this->header['Content-Length'] = strlen($this->body);
    }
    return $this->request('POST');
  }
   
  private function request($method) {
    $header = "";
    $this->requestLine = $method.' '.$this->urlinfo['path'].'?'.$this->urlinfo['query'].' '.$this->protocol;
    foreach ( $this->header as $key => $value ) {
      $header .= $header == "" ? $key.':'.$value : $this->sp.$key.':'.$value;
    }
    $this->requestHeader = $header.$this->sp.$this->sp;
    $this->requestInfo = $this->requestLine.$this->sp.$this->requestHeader;
    if ( $this->body != "" ) {
      $this->requestInfo .= $this->body;
    }
    /*
     * 注意：这里的fsockopen中的url参数形式为"www.xxx.com"
     * 不能够带"http://"这种
     */
    $port = isset($this->urlinfo['port']) ? isset($this->urlinfo['port']) : '80';
    $this->fp = fsockopen($this->urlinfo['host'], $port, $errno, $errstr);
    if ( !$this->fp ) {
      echo $errstr.'('.$errno.')';
      return false;
    }
    if ( fwrite($this->fp, $this->requestInfo) ) {
      $str = "";
      while ( !feof($this->fp) ) {
        $str .= fread($this->fp, 1024);
      }
      $this->responseInfo = $str;
    }
    fclose($this->fp);
    return $this->responseInfo;
  }
   
  private function parseurl($url) {
    $this->urlinfo = parse_url($url);
  }
}
// $url = "http://news.163.com/14/1102/01/AA0PFA7Q00014AED.html";
$url = "http://localhost/httppro/post.php";
$http = Http::create()->init($url);
/* 发送get请求 
echo $http->get(array(
  'User-Agent' => 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36',
));
*/
 
/* 发送post请求 */
echo $http->post(array(
    'User-Agent' => 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36',
), array('username'=>'发一个中文', 'age'=>22));