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DedeHttpDown PHP remote download web page class, enhanced version modified on 2013-1-17_PHP tutorial
Backend Development
PHP Tutorial
DedeHttpDown PHP remote download web page class, enhanced version modified on 2013-1-17_PHP tutorial
DedeHttpDown PHP remote download web page class, enhanced version modified on 2013-1-17_PHP tutorial
php
download
Host
Revise
judgment
Enhance
New
Version
of
kind
Web page
Remotely
1) Add remote host judgment to save server resources. Avoid fsockopen when the remote host does not exist, causing a crash and occupying the server CPU.
(2) Added judgment and support for responding to 401.
(3) Add support for json returned text.
(4) Log generation, if DEBUG_LEVEL is set and TRUE, a log will be generated for each remote download.
(5) Get the byte-limited dataLimit to save server resources.
(6) Modification date: 2013-1-17
If you have any better suggestions, you can contact me at any time. admin@zbphp.com
[php]
/**
* Dreamweaver HTTP download class
*
* @version $Id: dedehttpdown.class.php 1 11:42 July 6, 2010 Ztianya $
* @package DedeCMS.Libraries
* @copyright Copyright (c) 2007 - 2010, DesDev, Inc.
* @modify author admin@zbphp.com
* @license http://help.dedecms.com/usersguide/license.html
* @link http://www.dedecms.com
*/
@set_time_limit(0);
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 $dataLimit = 0;
var $m_puthead = '';
var $BaseUrlPath = '';
var $HomeUrl = '';
var $reTry = 0;
var $JumpCount = 0;
/**
* Initialization system
*
* @access public
* @param string $url The address to be downloaded
* @return string
*/
function PrivateInit($url)
{
if($url=='') {
return ;
} }
$urls = '';
$urls = @parse_url($url);
$this->m_url = $url;
if(is_array($urls))
{
$this->m_host = $urls["host"];
if(!emptyempty($urls["scheme"]))
$this->m_user = $urls["user"];
}
if(!emptyempty($urls["pass"]))
if(!emptyempty($urls["port"]))
{
$this->m_port = $urls["port"];
}
if(!emptyempty($urls["path"]))
{
$this->m_path = $urls["path"];
}
$this->m_urlpath = $this->m_path;
if(!emptyempty($urls["query"]))
{
$this->m_query = $urls["query"];
$this->m_urlpath .= "?".$this->m_query;
}
$this->HomeUrl = $urls["host"];
$this->BaseUrlPath = $this->HomeUrl.$urls["path"];
$this->BaseUrlPath = preg_replace("//([^/]*).(.*)$/","/",$this->BaseUrlPath);
$this->BaseUrlPath = preg_replace("//$/","",$this->BaseUrlPath);
}
}
/**
* Reset each parameter
*
* @access public
* @return void
*/
function ResetAny()
{
$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 = "";
}
/**
* Open the specified URL
*
* @access public
* @param string $url address
* @param string $requestType request type
* @return string
*/
function OpenUrl($url,$requestType="GET")
{
$this->ResetAny();
$this->JumpCount = 0;
$this->m_httphead = Array() ;
$this->m_html = '';
$this->dataLimit = 0;
$this->reTry = 0;
$this->Close();
//初始化系统
$this->PrivateInit($url);
$this->PrivateStartSession($requestType);
}
/**
* 转到303重定向网址
*
* @access public
* @param string $url address
* @return string
*/
function JumpOpenUrl($url)
{
$this->ResetAny();
$this->JumpCount++;
$this->m_httphead = Array();
$this->m_html = "";
$this->Close();
//Initialize the system
$this->PrivateInit($url);
$this->PrivateStartSession('GET');
}
/**
* Get the reason for an operation error
*
* @access public
* @return void
*/
function printError()
{
echo "Error message:".$this->m_error;
echo "
Specific return header:
";
Specific return header:
";
foreach($this->m_httphead as $k=>$v){ echo "$k => $v
rn"; }
rn"; }
}
/**
* Determine whether the response result of the header sent using the Get method is correct
*
* @access public
* @return bool
*/
function IsGetOK()
{
if( preg_match("/^2/",$this->GetHead("http-state")) )
{
return TRUE;
} }
else
{
$this->m_error .= $this->GetHead("http-state")." - ".$this->GetHead("http-describe")."
";
";
return FALSE;
} }
}
/**
* Check whether the returned web page is of text type
*
* @access public
* @return bool
*/
function IsText()
{
If( preg_match("/^(2|401)/",$this->GetHead("http-state")) && preg_match("/text|xml|json/i",$this-> ;GetHead("content-type")) )
{
return TRUE;
} else {
$this->m_error .= "The content is non-text type or URL redirection
";
";
return FALSE;
} }
}
/**
* Determine whether the returned web page is of a specific type
*
* @access public
* @param string $ctype content type
* @return string
*/
function IsContentType($ctype)
{
if(preg_match("/^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;
}
}
/**
* Download files using HTTP protocol
*
* @access public
* @param string $savefilename Save file name
* @return string
*/
function SaveToBin($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;
}
/**
* Save web page content as Text file
*
* @access public
* @param string $savefilename Save file name
* @return string
*/
function SaveToText($savefilename)
{
if($this->IsText())
{
$this->SaveBinFile($savefilename);
}
else
{
return "";
}
}
/**
* Use Http protocol to obtain the content of a web page
*
* @access public
* @return string
*/
function GetHtml()
{
$tm1 = microtime(true);
if(!$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);
if($this->dataLimit > 0 && strlen($this->m_html) > $this->dataLimit) break;
}
@fclose($this->m_fp);
$tm2 = microtime(true);
$log = "ntm2-tm1 = ".($tm2-$tm1);
$log.= "n".$this->m_html;
$this->log_write('GetHtml',$log);
return $this->m_html;
}
/**
* Start HTTP session
*
* @access public
* @param string $requestType Request type
* @return string
*/
function PrivateStartSession($requestType="GET")
{
if(!$this->PrivateOpenHost())
{
$this->m_error .= "打开远程主机出错!";
return FALSE;
}
$this->reTry++;
if($this->GetHead("http-edition")=="HTTP/1.1")
{
$httpv = "HTTP/1.1";
}
else
{
$httpv = "HTTP/1.0";
}
$ps = explode('?',$this->m_urlpath);
$headString = '';
//发送固定的起始请求头GET、Host信息
if($requestType=="GET")
{
$headString .= "GET ".$this->m_urlpath." $httpvrn";
}
else
{
$headString .= "POST ".$ps[0]." $httpvrn";
}
if($this->m_user || $this->m_pass)
{
$headString .= "Authorization: Basic ".base64_encode($this->m_user.":".$this->m_pass)."rn";
}
$this->m_puthead["Host"] = $this->m_host;
//发送用户自定义的请求头
if(!isset($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"];
}
/* add on 2012-12-19 */
$headString.="Connection:keep-alivern";
$headString.="Accept-Language:zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3rn";
$headString.="Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8rn";
foreach($this->m_puthead as $k=>$v)
{
$k = trim($k);
$v = trim($v);
if($k!=""&&$v!="")
{
$headString .= "$k: $vrn";
}
}
fputs($this->m_fp, $headString);
if($requestType=="POST")
{
$postdata = "";
if(count($ps)>1)
{
for($i=1;$i
{
$postdata .= $ps[$i];
}
}
else
{
$postdata = "OK";
}
$plen = strlen($postdata);
fputs($this->m_fp,"Content-Type: application/x-www-form-urlencodedrn");
fputs($this->m_fp,"Content-Length: $plenrn");
}
//发送固定的结束请求头
//HTTP1.1协议必须指定文档结束后关闭链接,否则读取文档时无法使用feof判断结束
if($httpv=="HTTP/1.1")
{
fputs($this->m_fp,"Connection: Closernrn");
}
else
{
fputs($this->m_fp,"rn");
}
if($requestType=="POST")
{
fputs($this->m_fp,$postdata);
}
//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($hvalue);
}
}
//如果连接被不正常关闭，重试
if(feof($this->m_fp))
{
if($this->reTry > 10)
{
return FALSE;
}
$this->PrivateStartSession($requestType);
}
//判断是否是3xx开头的应答
if(preg_match("/^3/",$this->m_httphead["http-state"]))
{
if($this->JumpCount > 3)
{
return;
}
if(isset($this->m_httphead["location"]))
{
$newurl = $this->m_httphead["location"];
if(preg_match("/^http/i",$newurl))
{
$this->JumpOpenUrl($newurl);
}
else
{
$newurl = $this->FillUrl($newurl);
$this->JumpOpenUrl($newurl);
}
}
else
{
$this->m_error = "无法识别的答复！";
}
}
}
/**
* Get the value of an HTTP header
*
* @access public
* @param string $headname Header file name
* @return string
*/
function GetHead($headname)
{
$headname = strtolower($headname);
return isset($this->m_httphead[$headname]) ? $this->m_httphead[$headname] : '';
}
/**
* Set the value of Http header
*
* @access public
* @param string $skey key
* @param string $svalue value
* @return string
*/
function SetHead($skey,$svalue)
{
$this->m_puthead[$skey] = $svalue;
}
/**
* Open connection
*
* @access public
* @return bool
*/
function PrivateOpenHost()
{
if($this->m_host=="")
{
return FALSE;
}
if(function_exists('checkdnsrr') && !checkdnsrr($this->m_host,'A') && !checkdnsrr($this->m_host,'CNAME'))
{
$this->m_error = '远程主机'.$this->m_host.'不存在!checkdnsrr !';
return FALSE;
}
$errno = "";
$errstr = "";
$this->m_fp = @fsockopen($this->m_host, $this->m_port, $errno, $errstr,10);
if(!$this->m_fp)
{
$this->m_error = $errstr;
return FALSE;
}
else
{
return TRUE;
}
}
/**
* Close connection
*
* @access public
* @return void
*/
function Close()
{
@fclose($this->m_fp);
}
/**
* Complete relative URL
*
* @access public
* @param string $surl requires an incomplete address
* @return string
*/
function FillUrl($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($surl)<=1)
{
return "";
}
else if($surl[1]=="/")
{
$okurl = "http://".$this->BaseUrlPath."/".substr($surl,2,strlen($surl)-2);
}
else
{
$urls = explode("/",$surl);
foreach($urls as $u)
{
if($u=="..")
{
$pathStep++;
}
else if($i
{
$dstr .= $urls[$i]."/";
}
else
{
$dstr .= $urls[$i];
}
$i++;
}
$urls = explode("/",$this->BaseUrlPath);
if(count($urls) <= $pathStep)
{
return "";
}
else
{
$pstr = "http://";
for($i=0;$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;
}
}
$okurl = preg_replace("/^(http://)/i","",$okurl);
$okurl = preg_replace("//{1,}/", "/", $okurl);
return "http://".$okurl;
}
function log_write($funcname,$message)
{
if(!(defined('DEBUG_LEVEL') && DEBUG_LEVEL == TRUE)) return ;
$log = "n".date("Y-M-d H:i:s ").get_current_user()."[".getmypid()."]";
$log.= "n".$this->m_url."n".str_repeat('------', 10)."n".$message;
$path = $funcname.' '.date('Y m d H i s ').preg_replace('/([W]+|s+)/i', ' ', $this->m_url);
if(strlen($path) > 250) $path = substr($path,0,250);
$dir = DEDEDATA.'/httpdownlog';
if(!is_dir($dir) && !mkdir($dir)) exit('Can not make dir '.$dir);
$path = $dir.'/'.$path;
if(!file_exists($path)) touch($path);
$fp = fopen($path,'a+');
flock($fp, LOCK_EX);
fputs($fp, "PATH:".$path."nREAL:".realpath($path)."nMSSG:".$log);
fclose($fp);
return TRUE;
}
}//End Class
使用方法：
[php]
$dhd = new DeDeHttpDown();
$dhd->OpenUrl($Rs['wurl']);
$dhd->dataLimit = 5120;
$dhd->m_puthead["Refer"] = $Rs['wurl'];
$filecnt = trim($dhd->GetHtml());
存在未解决的问题：
（1）假如域名是绑定了A记录和CNAME，有ip指向，但是IP地址是不存在的或者虚假的，程序仍旧会继续获取。
（2）PHP的fsockopen 里面的time out貌似根本就没有起作用。设置了10s超时，但是根本就是执行到程序time out 为止。
如果好的方法建议，可以随时联系我本人。admin@zbphp.com
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