首页
所有分类
TAGS
文字工具 EMOJI BIBLE
编程 PHP

发布一个用PHP fsockopen写的HTTP下载的类

Posted in PHP onFebruary 22, 2007

如果支持打开远程内容的选项的话，实际上php用fopen或file_get_contents都能获得一个网页的内容，但是默认的函数有个不足的地方就是无法获取HTTP头，这在一些特殊的应用中很不方便，如，有一个链接：

http://www.abc.com/showvd.asp?id=18 

假如它返回的是一个图片，用默认函数就很难识别，但如果通过HTTP应答头来判断就简单多了，此外如果对方通过 Refer 来防盗链的话，也是无法获取的，用HTTP类就能完美解决这些问题，而且速度也相差无几。

使用方法：

$hd = new DedeHttpDown();
$hd->OpenUrl("http://www.dedecms.com");
echo $hd->GetHtml();
//如果保存为文件则用 $hd->SaveBin("dede.html");
$hd->Close();

获得http请求头用
$hd->GetHead("key")
设置请求头
$hd->SetHead(key,value); (必须在调用 OpenUrl 之前设定)

代码如下:

<?
/* ---------------------------------------------------------------------
//织梦Http下载类V1.0
//出自：织梦之旅 http://www.dedecms.com
//作者: IT柏拉图
//时间: 2005-11-13 12:39
//声明: 首发在落伍者网站，转载请保留版权信息
--------------------------------------------------------------------- */
class DedeHttpDown
{
        var $m_url = "";
        var $m_urlpath = "";
        var $m_scheme = "http";
        var $m_host = "";
        var $m_port = "80";
        var $m_user = "";
        var $m_pass = "";
        var $m_path = "/";
        var $m_query = "";
        var $m_fp = "";
        var $m_error = "";
        var $m_httphead = "" ;
        var $m_html = "";
        var $m_puthead = "";
        var $BaseUrlPath = "";
        var $HomeUrl = "";
        var $JumpCount = 0;//防止多重重定向陷入死循环
        //
        //初始化系统
        //
        function PrivateInit($url)
        {
                        if($url=="") return ;
                        $urls = "";
                        $urls = @parse_url($url);
                        $this->m_url = $url;
            if(is_array($urls))
            {
                          $this->m_host = $urls["host"];
                          if(!empty($urls["scheme"])) $this->m_scheme = $urls["scheme"];

                          if(!empty($urls["user"])){
                                        $this->m_user = $urls["user"];
                          }

                          if(!empty($urls["pass"])){
                                        $this->m_pass = $urls["pass"];
                          }

                          if(!empty($urls["port"])){
                                        $this->m_port = $urls["port"];
                          }

                          if(!empty($urls["path"])) $this->m_path = $urls["path"];
                          $this->m_urlpath = $this->m_path;

                          if(!empty($urls["query"])){
                                        $this->m_query = $urls["query"];
                                        $this->m_urlpath .= "?".$this->m_query;
                          }
                          $this->HomeUrl = $urls["host"];
                          $this->BaseUrlPath = $this->HomeUrl.$urls["path"];
                          $this->BaseUrlPath = ereg_replace("/([^/]*)\.(.*)$","/",$this->BaseUrlPath);
                          $this->BaseUrlPath = ereg_replace("/$","",$this->BaseUrlPath);
                 }
        }
        //
        //打开指定网址
        //
        function OpenUrl($url)
        {
                //重设各参数
                $this->m_url = "";
                $this->m_urlpath = "";
                $this->m_scheme = "http";
                $this->m_host = "";
                $this->m_port = "80";
                $this->m_user = "";
                $this->m_pass = "";
                $this->m_path = "/";
                $this->m_query = "";
                $this->m_error = "";
                $this->JumpCount = 0;
                $this->m_httphead = Array() ;
                //$this->m_puthead = "";
                $this->m_html = "";
                $this->Close();
                //初始化系统
                $this->PrivateInit($url);
                $this->PrivateStartSession();
        }
        //
        //打开303重定向网址
        //
        function JumpOpenUrl($url)
        {
                //重设各参数
                $this->m_url = "";
                $this->m_urlpath = "";
                $this->m_scheme = "http";
                $this->m_host = "";
                $this->m_port = "80";
                $this->m_user = "";
                $this->m_pass = "";
                $this->m_path = "/";
                $this->m_query = "";
                $this->m_error = "";
                $this->JumpCount++;
                $this->m_httphead = Array() ;
                $this->m_html = "";
                $this->Close();
                //初始化系统
                $this->PrivateInit($url);
                $this->PrivateStartSession();
        }
        //
        //获得某操作错误的原因
        //
        function printError()
        {
                echo "错误信息：".$this->m_error;
                echo "具体返回头：<br>";
                foreach($this->m_httphead as $k=>$v)
                { echo "$k => $v <br>\r\n"; }
        }
        //
        //判别用Get方法发送的头的应答结果是否正确
        //
        function IsGetOK()
        {
                if( ereg("^2",$this->GetHead("http-state")) )
                {        return true; }
                else
                {
                        $this->m_error .= $this->GetHead("http-state")." - ".$this->GetHead("http-describe")."<br>";
                        return false;
                }
        }
        //
        //看看返回的网页是否是text类型
        //
        function IsText()
        {
                if(ereg("^2",$this->GetHead("http-state"))
                        && eregi("^text",$this->GetHead("content-type")))
                {        return true; }
                else
                {
                        $this->m_error .= "内容为非文本类型或网址重定向<br>";
                        return false;
                }
        }
        //
        //判断返回的网页是否是特定的类型
        //
        function IsContentType($ctype)
        {
                if(ereg("^2",$this->GetHead("http-state"))
                        && $this->GetHead("content-type")==strtolower($ctype))
                {        return true; }
                else
                {
                        $this->m_error .= "类型不对 ".$this->GetHead("content-type")."<br>";
                        return false;
                }
        }
        //
        //用Http协议下载文件
        //
        function SaveToBin($savefilename)
        {
                if(!$this->IsGetOK()) return false;
                if(@feof($this->m_fp)) { $this->m_error = "连接已经关闭！"; return false; }
                $fp = fopen($savefilename,"w");
                while(!feof($this->m_fp)){
                        fwrite($fp,fread($this->m_fp,1024));
                }
                fclose($this->m_fp);

                fclose($fp);
                return true;
        }
        //
        //保存网页内容为Text文件
        //
        function SaveToText($savefilename)
        {
                if($this->IsText()) $this->SaveBinFile($savefilename);
                else return "";
        }
        //
        //用Http协议获得一个网页的内容
        //
        function GetHtml()
        {
                if(!$this->IsText()) return "";
                if($this->m_html!="") return $this->m_html;
                if(!$this->m_fp||@feof($this->m_fp)) return "";
                while(!feof($this->m_fp)){
                        $this->m_html .= fgets($this->m_fp,256);
                }
                @fclose($this->m_fp);
                return $this->m_html;
        }
        //
        //开始HTTP会话
        //
        function PrivateStartSession()
        {

                if(!$this->PrivateOpenHost()){
                        $this->m_error .= "打开远程主机出错!";
                        return false;
                }

                if($this->GetHead("http-edition")=="HTTP/1.1") $httpv = "HTTP/1.1";
                else $httpv = "HTTP/1.0";

                //发送固定的起始请求头GET、Host信息
                fputs($this->m_fp,"GET ".$this->m_urlpath." $httpv\r\n");
                $this->m_puthead["Host"] = $this->m_host;

                //发送用户自定义的请求头
                if(!isset($this->m_puthead["Accept"])) { $this->m_puthead["Accept"] = "*/*"; }
                if(!isset($this->m_puthead["User-Agent"])) { $this->m_puthead["User-Agent"] = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2)"; }
                if(!isset($this->m_puthead["Refer"])) { $this->m_puthead["Refer"] = "http://".$this->m_puthead["Host"]; }
                foreach($this->m_puthead as $k=>$v){
                        $k = trim($k);
                        $v = trim($v);
                        if($k!=""&&$v!=""){
                                fputs($this->m_fp,"$k: $v\r\n");
                        }
                }

                //发送固定的结束请求头
                //HTTP1.1协议必须指定文档结束后关闭链接,否则读取文档时无法使用feof判断结束
                if($httpv=="HTTP/1.1") fputs($this->m_fp,"Connection: Close\r\n\r\n");
                else fputs($this->m_fp,"\r\n");

                //获取应答头状态信息
                $httpstas = explode(" ",fgets($this->m_fp,256));
                $this->m_httphead["http-edition"] = trim($httpstas[0]);
                $this->m_httphead["http-state"] = trim($httpstas[1]);
                $this->m_httphead["http-describe"] = "";
                for($i=2;$i<count($httpstas);$i++){
                        $this->m_httphead["http-describe"] .= " ".trim($httpstas[$i]);
                }
                //获取详细应答头
                while(!feof($this->m_fp)){
                        $line = trim(fgets($this->m_fp,256));
                        if($line == "") break;
                        $hkey = "";
                        $hvalue = "";
                        $v = 0;
                        for($i=0;$i<strlen($line);$i++){
                                if($v==1) $hvalue .= $line[$i];
                                if($line[$i]==":") $v = 1;
                                if($v==0) $hkey .= $line[$i];
                        }
                        $hkey = trim($hkey);
                        if($hkey!="") $this->m_httphead[strtolower($hkey)] = trim($hvalue);
                }
                //判断是否是3xx开头的应答
                if(ereg("^3",$this->m_httphead["http-state"]))
                {
                        if($this->JumpCount > 3) return;
                        if(isset($this->m_httphead["location"])){
                                $newurl = $this->m_httphead["location"];
                                if(eregi("^http",$newurl)){
                                        $this->JumpOpenUrl($newurl);
                                }
                                else{
                                        $newurl = $this->FillUrl($newurl);
                                        $this->JumpOpenUrl($newurl);
                                }
                        }
                        else
                        {        $this->m_error = "无法识别的转移应答！"; }
                }//
        }
        //
        //获得一个Http头的值
        //
        function GetHead($headname)
        {
                $headname = strtolower($headname);
                if(isset($this->m_httphead[$headname]))
                        return $this->m_httphead[$headname];
                else
                        return "";
        }
        //
        //设置Http头的值
        //
        function SetHead($skey,$svalue)
        {
                $this->m_puthead[$skey] = $svalue;
        }
        //
        //打开连接
        //
        function PrivateOpenHost()
        {
                if($this->m_host=="") return false;
                $this->m_fp = @fsockopen($this->m_host, $this->m_port, &$errno, &$errstr,10);
                if(!$this->m_fp){
                        $this->m_error = $errstr;
                        return false;
                }
                else{
                        return true;
                }
        }
        //
        //关闭连接
        //
        function Close(){
                @fclose($this->m_fp);
        }
        //
        //补全相对网址
        //
        function FillUrl($surl)
  {
    $i = 0;
    $dstr = "";
    $pstr = "";
    $okurl = "";
    $pathStep = 0;
    $surl = trim($surl);
    if($surl=="") return "";
    $pos = strpos($surl,"#");
    if($pos>0) $surl = substr($surl,0,$pos);
    if($surl[0]=="/"){
            $okurl = "http://".$this->HomeUrl."/".$surl;
    }
    else if($surl[0]==".")
    {
      if(strlen($surl)<=2) return "";
      else if($surl[0]=="/")
      {
              $okurl = "http://".$this->BaseUrlPath."/".substr($surl,2,strlen($surl)-2);
            }
      else{
        $urls = explode("/",$surl);
        foreach($urls as $u){
          if($u=="..") $pathStep++;
          else if($i<count($urls)-1) $dstr .= $urls[$i]."/";
          else $dstr .= $urls[$i];
          $i++;
        }
        $urls = explode("/",$this->BaseUrlPath);
        if(count($urls) <= $pathStep)
                return "";
        else{
          $pstr = "http://";
          for($i=0;$i<count($urls)-$pathStep;$i++)
          { $pstr .= $urls[$i]."/"; }
          $okurl = $pstr.$dstr;
        }
      }
    }
    else
    {
      if(strlen($surl)<7)
        $okurl = "http://".$this->BaseUrlPath."/".$surl;
      else if(strtolower(substr($surl,0,7))=="http://")
        $okurl = $surl;
      else
        $okurl = "http://".$this->BaseUrlPath."/".$surl;
    }
    $okurl = eregi_replace("^(http://)","",$okurl);
    $okurl = eregi_replace("/{1,}","/",$okurl);
    return "http://".$okurl;
  }
}
?>

发布一个用PHP fsockopen写的HTTP下载的类

声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。

PHP 相关文章推荐
基于mysql的bbs设计（五）
Oct 09 PHP
IIS+PHP+MySQL+Zend配置 (视频教程)
Dec 13 PHP
mysql 性能的检查和优化方法
Jun 21 PHP
hessian 在PHP中的使用介绍
Dec 13 PHP
php开发环境配置记录
Jan 14 PHP
浅析PHP递归函数返回值使用方法
Feb 18 PHP
php强制更新图片缓存的方法
Feb 11 PHP
WordPress中邮件的一些修改和自定义技巧
Dec 15 PHP
关于PHP转换超过2038年日期出错的问题解决
Jun 28 PHP
PHP实现函数内修改外部变量值的方法示例
Dec 28 PHP
Laravel框架创建路由的方法详解
Sep 04 PHP
php日志函数error_log用法实例分析
Sep 23 PHP
隐藏X-Space个人空间下方版权方法隐藏X-Space个人空间标题隐藏X-Space个人空间管理版权方法
Feb 22 #PHP
excellent!――ASCII Art（由目标图象生成ascii）
Feb 20 #PHP
珊瑚虫IP库浅析
Feb 15 #PHP
PHP中HTTP方式下的Gzip压缩传输方法举偶
Feb 15 #PHP
PHP+.htaccess实现全站静态HTML文件GZIP压缩传输(一)
Feb 15 #PHP
php调用mysql存储过程
Feb 14 #PHP
mysql中存储过程、函数的一些问题
Feb 14 #PHP
克隆(1) 外键(1) #{}(1) IC-R9500(1) canvas(2) 选择器(1) 脏读(2) 代理(2) SQL注入(2) 增删查改(1)
You might like
十天学会php之第五天
2006/10/09 PHP
解决dede生成静态页和动态页转换的一些问题，及火车采集入库生成动态的办法
2007/03/29 PHP
php绘图之加载外部图片的方法
2015/01/24 PHP
Laravel框架路由设置与使用示例
2018/06/12 PHP
javascript之更有效率的字符串替换
2008/08/02 Javascript
Js组件的一些写法
2010/09/10 Javascript
js导出table到excel同时兼容FF和IE示例
2013/09/03 Javascript
js 去掉空格实例 Trim() LTrim() RTrim()
2014/01/07 Javascript
开发中可能会用到的jQuery小技巧
2014/03/07 Javascript
在JS数组特定索引处指定位置插入元素
2014/07/27 Javascript
详解JavaScript对W3C DOM模版的支持情况
2015/06/16 Javascript
JS将滑动门改为选项卡（需鼠标点击）的实现方法
2015/09/27 Javascript
js+ajax实现获取文件大小的方法
2015/12/08 Javascript
jQuery ajax请求返回list数据动态生成input标签,并把list数据赋值到input标签
2016/03/29 Javascript
Angular 数据请求的实现方法
2018/05/07 Javascript
基于webpack4搭建的react项目框架的方法
2018/06/30 Javascript
微信小程序实现点击效果
2019/06/21 Javascript
深入Python解释器理解Python中的字节码
2015/04/01 Python
Python序列化基础知识（json/pickle）
2017/10/19 Python
Python中栈、队列与优先级队列的实现方法
2019/06/30 Python
Python3 实现爬取网站下所有URL方式
2020/01/16 Python
新建文件时Pycharm中自动设置头部模板信息的方法
2020/04/17 Python
解决python虚拟环境切换无效的问题
2020/04/30 Python
One.com挪威：北欧成长最快的网络托管公司
2016/11/19 全球购物
美国床垫和床上用品公司：Nest Bedding
2017/06/12 全球购物
英国第一独立滑雪板商店：The Snowboard Asylum
2020/01/16 全球购物
如何实现一个自定义类的序列化
2012/05/22 面试题
Java面向对象面试题
2016/12/26 面试题
商场总经理岗位职责
2014/02/03 职场文书
经营理念口号
2014/06/21 职场文书
2014中学教师节广播稿
2014/09/10 职场文书
教师批评与自我批评（群众路线）
2014/10/15 职场文书
2015新学期开学寄语
2015/02/26 职场文书
MongoDB balancer的使用详解
2021/04/30 MongoDB
AudioContext 实现音频可视化(web技术分享)
2022/02/24 Javascript
Python Django / Flask如何使用Elasticsearch
2022/04/19 Python