Maison php教程 php手册 发布一个用PHP fsockopen写的HTTP下载的类

发布一个用PHP fsockopen写的HTTP下载的类

Jun 13, 2016 pm 12:33 PM
fsockopen http php 下载 内容 发布 打开 支持 utiliser de 远程 选项

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:
";
                foreach($this->m_httphead as $k=>$v)
                { echo "$k => $v 
\r\n"; }
        }
        //
        //判别用Get方法发送的头的应答结果是否正确
        //
        function IsGetOK()
        {
                if( ereg("^2",$this->GetHead("http-state")) )
                {        return true; }
                else
                {
                        $this->m_error .= $this->GetHead("http-state")." - ".$this->GetHead("http-describe")."
";
                        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
                {
                        $this->m_error .= "内容为非文本类型或网址重定向
";
                        return false;
                }
        }
        //
        //判断返回的网页是否是特定的类型
        //
        function IsContentType($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")."
";
                        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                        $this->m_httphead["http-describe"] .= " ".trim($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;$i                                if($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($surl)      else if($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          else $dstr .= $urls[$i];
          $i++;
        }
        $urls = explode("/",$this->BaseUrlPath);
        if(count($urls)                 return "";
        else{
          $pstr = "http://";
          for($i=0;$i          { $pstr .= $urls[$i]."/"; }
          $okurl = $pstr.$dstr;
        }
      }
    }
    else
    {
      if(strlen($surl)        $okurl = "http://".$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;
  }
}
?>

Déclaration de ce site Web
Le contenu de cet article est volontairement contribué par les internautes et les droits d'auteur appartiennent à l'auteur original. Ce site n'assume aucune responsabilité légale correspondante. Si vous trouvez un contenu suspecté de plagiat ou de contrefaçon, veuillez contacter admin@php.cn

Article chaud

Combien de temps faut-il pour battre Split Fiction?
3 Il y a quelques semaines By DDD
Repo: Comment relancer ses coéquipiers
3 Il y a quelques semaines By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: Comment obtenir des graines géantes
3 Il y a quelques semaines By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Crystals d'énergie expliqués et ce qu'ils font (cristal jaune)
1 Il y a quelques semaines By 尊渡假赌尊渡假赌尊渡假赌

Article chaud

Combien de temps faut-il pour battre Split Fiction?
3 Il y a quelques semaines By DDD
Repo: Comment relancer ses coéquipiers
3 Il y a quelques semaines By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: Comment obtenir des graines géantes
3 Il y a quelques semaines By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Crystals d'énergie expliqués et ce qu'ils font (cristal jaune)
1 Il y a quelques semaines By 尊渡假赌尊渡假赌尊渡假赌

Tags d'article chaud

Bloc-notes++7.3.1

Bloc-notes++7.3.1

Éditeur de code facile à utiliser et gratuit

SublimeText3 version chinoise

SublimeText3 version chinoise

Version chinoise, très simple à utiliser

Envoyer Studio 13.0.1

Envoyer Studio 13.0.1

Puissant environnement de développement intégré PHP

Dreamweaver CS6

Dreamweaver CS6

Outils de développement Web visuel

SublimeText3 version Mac

SublimeText3 version Mac

Logiciel d'édition de code au niveau de Dieu (SublimeText3)

Guide d'installation et de mise à niveau de PHP 8.4 pour Ubuntu et Debian Guide d'installation et de mise à niveau de PHP 8.4 pour Ubuntu et Debian Dec 24, 2024 pm 04:42 PM

Guide d'installation et de mise à niveau de PHP 8.4 pour Ubuntu et Debian

Date et heure de CakePHP Date et heure de CakePHP Sep 10, 2024 pm 05:27 PM

Date et heure de CakePHP

Téléchargement de fichiers CakePHP Téléchargement de fichiers CakePHP Sep 10, 2024 pm 05:27 PM

Téléchargement de fichiers CakePHP

Routage CakePHP Routage CakePHP Sep 10, 2024 pm 05:25 PM

Routage CakePHP

Configuration du projet CakePHP Configuration du projet CakePHP Sep 10, 2024 pm 05:25 PM

Configuration du projet CakePHP

Discuter de CakePHP Discuter de CakePHP Sep 10, 2024 pm 05:28 PM

Discuter de CakePHP

Guide rapide CakePHP Guide rapide CakePHP Sep 10, 2024 pm 05:27 PM

Guide rapide CakePHP

Comment configurer Visual Studio Code (VS Code) pour le développement PHP Comment configurer Visual Studio Code (VS Code) pour le développement PHP Dec 20, 2024 am 11:31 AM

Comment configurer Visual Studio Code (VS Code) pour le développement PHP

See all articles