发布一个用PHP fsockopen写的HTTP下载的类_php教程-查字典教程网
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
发布时间：2016-12-29 来源：查字典编辑
摘要：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...

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=newDedeHttpDown();

$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:2005-11-1312:39

//声明:首发在落伍者网站，转载请保留版权信息

---------------------------------------------------------------------*/

classDedeHttpDown

{

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

//

functionPrivateInit($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

//

functionOpenUrl($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

//

functionJumpOpenUrl($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

//

functionprintError()

{

echo"错误信息：".$this->m_error;

echo"具体返回头：<br>";

foreach($this->m_httpheadas$k=>$v)

{echo"$k=>$v<br>rn";}

}

//

//判别用Get方法发送的头的应答结果是否正确

//

functionIsGetOK()

{

if(ereg("^2",$this->GetHead("http-state")))

{returntrue;}

else

{

$this->m_error.=$this->GetHead("http-state")."-".$this->GetHead("http-describe")."<br>";

returnfalse;

}

}

//

//看看返回的网页是否是text类型

//

functionIsText()

{

if(ereg("^2",$this->GetHead("http-state"))

&&eregi("^text",$this->GetHead("content-type")))

{returntrue;}

else

{

$this->m_error.="内容为非文本类型或网址重定向<br>";

returnfalse;

}

}

//

//判断返回的网页是否是特定的类型

//

functionIsContentType($ctype)

{

if(ereg("^2",$this->GetHead("http-state"))

&&$this->GetHead("content-type")==strtolower($ctype))

{returntrue;}

else

{

$this->m_error.="类型不对".$this->GetHead("content-type")."<br>";

returnfalse;

}

}

//

//用Http协议下载文件

//

functionSaveToBin($savefilename)

{

if(!$this->IsGetOK())returnfalse;

if(@feof($this->m_fp)){$this->m_error="连接已经关闭！";returnfalse;}

$fp=fopen($savefilename,"w");

while(!feof($this->m_fp)){

fwrite($fp,fread($this->m_fp,1024));

}

fclose($this->m_fp);

fclose($fp);

returntrue;

}

//

//保存网页内容为Text文件

//

functionSaveToText($savefilename)

{

if($this->IsText())$this->SaveBinFile($savefilename);

elsereturn"";

}

//

//用Http协议获得一个网页的内容

//

functionGetHtml()

{

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

//

functionPrivateStartSession()

{

if(!$this->PrivateOpenHost()){

$this->m_error.="打开远程主机出错!";

returnfalse;

}

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."$httpvrn");

$this->m_puthead["Host"]=$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;MSIE6.0;WindowsNT5.2)";}

if(!isset($this->m_puthead["Refer"])){$this->m_puthead["Refer"]="http://".$this->m_puthead["Host"];}

foreach($this->m_putheadas$k=>$v){

$k=trim($k);

$v=trim($v);

if($k!=""&&$v!=""){

fputs($this->m_fp,"$k:$vrn");

}

}

//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:Closernrn");

elsefputs($this->m_fp,"rn");

//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

//

functionGetHead($headname)

{

$headname=strtolower($headname);

if(isset($this->m_httphead[$headname]))

return$this->m_httphead[$headname];

else

return"";

}

//

//设置Http头的值

//

functionSetHead($skey,$svalue)

{

$this->m_puthead[$skey]=$svalue;

}

//

//打开连接

//

functionPrivateOpenHost()

{

if($this->m_host=="")returnfalse;

$this->m_fp=@fsockopen($this->m_host,$this->m_port,&$errno,&$errstr,10);

if(!$this->m_fp){

$this->m_error=$errstr;

returnfalse;

}

else{

returntrue;

}

}

//

//关闭连接

//

functionClose(){

@fclose($this->m_fp);

}

//

//补全相对网址

//

functionFillUrl($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;

}

elseif($surl[0]==".")

{

if(strlen($surl)<=2)return"";

elseif($surl[0]=="/")

{

$okurl="http://".$this->BaseUrlPath."/".substr($surl,2,strlen($surl)-2);

}

else{

$urls=explode("/",$surl);

foreach($urlsas$u){

if($u=="..")$pathStep++;

elseif($i<count($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;

elseif(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;

}

}

?>

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