PHP - Download Multiple Files Using One Button

Hi Guys I trying to download files and I have this error message, hopelly you guys can help me please Warning: Cannot modify header information - headers already sent by (output started at /home/content/04/12746204/html/Digital/core/inc/init.inc.php:6) in /home/content/04/12746204/html/Digital/download.php on line 14

Warning: Cannot modify header information - headers already sent by (output started at /home/content/04/12746204/html/Digital/core/inc/init.inc.php:6) in /home/content/04/12746204/html/Digital/download.php on line 15

Warning: Cannot modify header information - headers already sent by (output started at /home/content/04/12746204/html/Digital/core/inc/init.inc.php:6) in /home/content/04/12746204/html/Digital/download.php on line 16

Warning: Cannot modify header information - headers already sent by (output started at /home/content/04/12746204/html/Digital/core/inc/init.inc.php:6) in /home/content/04/12746204/html/Digital/download.php on line 17

Warning: Cannot modify header information - headers already sent by (output started at /home/content/04/12746204/html/Digital/core/inc/init.inc.php:6) in /home/content/04/12746204/html/Digital/download.php on line 18     This is the code I use to force the download

<?php
include('core/inc/init.inc.php');
   if(isset($_GET['file_id'])) {  
     $file_id=(int)$_GET['file_id'];    
     $file=mysql_query("SELECT file_name, file_expiry FROM files WHERE file_id=$file_id");    
     if(mysql_num_rows($file)!=1){   
       echo'Invalid file Id';
     }else{
       $row=mysql_fetch_assoc($file);
       if ($row['file_expiry']<time()){
          echo'This file has expired'; 
       }else{
              $path="core/files/{$row['$file_name']}";
              header('Content-Type:application/octet-stream');
              header('Content-Description:File Transfer');
              header('Content-Transfer-Encoding:binary');
              header("Content-Disposition:attachment;filename=\"{$row['file_name']}\"");
              header('Content-Length:'.filesize($path));
              readfile($path);
       }
     }
}
?>

Thank you for your help.....

I've searched the forum, and haven't yet found what I need.

I have a long list of PDF files:  http://www.iampeth.com/vintage_magazines.php

How can I track the number of downloads for each file?

Hi PHP Community,
I have this class in my DOCMAN script and would like to add aditional functionality to watermark existing PDF files:

Code: [Select]
class DOCMAN_File
{
/**
* @access public
* @var string
*/
    var $path = null;
/**
* @access public
* @var string
*/
    var $name = null;
/**
* @access public
* @var string
*/
    var $mime = null;
    /**
* @access public
* @var string
*/
    var $ext = null;
   
    /**
* @access public
* @var string
*/
    var $size = null;
   
    /**
* @access public
* @var string
*/
    var $date = null;
   
    /**
* @access private
* @var string
*/
    var $_err    = null;

/**
* @access private
* @var boolean
*/
var $_isLink;

function DOCMAN_File($name, $path)
{
$path = mosPathName( $path );
if (!is_dir( $path )) {
$path = dirname( $path );
}

$this->name = trim($name);
$this->path = $path;

if( strcasecmp( substr( $this->name , 0, _DM_DOCUMENT_LINK_LNG ) , _DM_DOCUMENT_LINK )==0){
$this->_isLink = true;
$this->size    = 0;
$this->mime    = 'link';
}else{
$this->_isLink = false;
$this->size = filesize($this->path."/".$this->name);
$this->mime = DOCMAN_MIME_Magic::filenameToMIME($this->name, false);
}

$this->ext  = $this->getExtension();
}


/**
*    Download or view a file from the server
*    @desc This is the function handling files downloading using HTTP protocol
*    @param void
*    @return void
*/

    function download()
    {
$user_agent = (isset($_SERVER["HTTP_USER_AGENT"]) ) ?
$_SERVER["HTTP_USER_AGENT"] : $HTTP_USER_AGENT;

//Fixed [#2534] clean all output buffers (needs PHP > 4.2.0)
  /* while (ob_get_level()) {
      * ob_end_clean();
    }*/
// Fix [3164]
while (@ob_end_clean());

if( $this->_isLink ){
header( "Location: " . substr( $this->name , 6 ) );
return;
}

$fsize = filesize($this->path."/".$this->name);
$mod_date = date('r', filemtime( $this->path.'/'.$this->name ) );

$cont_dis = 'attachment;';
if(isset($_REQUEST['mode']))
$cont_dis = ($_REQUEST['mode'] == 'view') ? 'inline;' : 'attachment;';

        header("Pragma: public");
        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
        header("Expires: 0");

        header("Content-Transfer-Encoding: binary");
header('Content-Disposition:' . $cont_dis .'";'
. ' filename="' . $this->name . '";'
. ' modification-date="' . $mod_date . '";'
. ' size=' . $fsize .';'
); //RFC2183
        header("Content-Location: ". $this->path . '/' . $this->name );
        header("Content-Type: "    . $this->mime ); // MIME type
        header("Content-Length: "  . $fsize);

  // No encoding - we aren't using compression... (RFC1945)
// header("Content-Encoding: ");

        readfile($this->path."/".$this->name);
        // The caller MUST 'die();'
    }
   
function exists() {
if( $this->_isLink ){
return true;
}
    return file_exists($this->path."/".$this->name);
    }

function isLink(){
return $this->_isLink ;
}
   
    /**
*    Get file size
*
*    @desc Gets the file size and convert it to friendly format
*    @param void
*    @return string Returns filesize in a friendly format.
*/

function getSize()
    {
if( $this->_isLink ){
return 'Link';
}
        $kb = 1024;
        $mb = 1024 * $kb;
        $gb = 1024 * $mb;
        $tb = 1024 * $gb;
       
        $size = $this->size;
       
        if ($size) {
            if ($size < $kb) {
                $file_size = "$size Bytes";
            }
            elseif ($size < $mb) {
                $final = round($size/$kb,2);
                $file_size = "$final KB";
            }
            elseif ($size < $gb) {
                $final = round($size/$mb,2);
                $file_size = "$final MB";
            }
            elseif($size < $tb) {
                $final = round($size/$gb,2);
                $file_size = "$final GB";
            } else {
                $final = round($size/$tb,2);
                $file_size = "$final TB";
            }
        } else {
  if( $size == 0 )
    $file_size = "Empty!";
  else
            $file_size = "ERROR";
        }
        return $file_size;
    }
   
    /**
*    @desc Gets the extension of a file
*    @return string The file extension
*/
   
    function getExtension()
    {
if( $this->_isLink )
return "lnk";

        $dotpos = strrpos($this->name, ".");
        if ($dotpos < 1)
            return "unk";

        return substr($this->name, $dotpos + 1);
    }
   
    function getDate($type = 'm')
    {
if( $this->_isLink ){
return "";
}

    $date = '';
   
    switch($type)
    {
    case 'm' :
    $date = filemtime($this->path."/".$this->name);
    break;
    case 'a' :
    $date = fileatime($this->path."/".$this->name);
    break;
    case 'c' :
    $date = filectime($this->path."/".$this->name);
    break;
    }
   
    return date ("m.d.y - H:i:s", mosFormatDate($date));
    }
}

I found this function on the net and it works fast. But because I'm newbie I have problem in implementing it correctly to class:

Code: [Select]
        function WaterMark($filename){
                $tempfile=tempnam('/path/to/directory/tmp,'temp.pdf');
                $watermark = "/path/to/directory/htdocs/components/com_docman/includes_frontend/water.pdf";
                system("pdftk $filename stamp $watermark output $tempfile dont_ask", $errcode);
                if (!$errcode && $ih=fopen($tempfile, 'r')) {
                header('Content-Type: application/pdf');
                fpassthru($ih);
                fclose($ih);
                } else {
                print "Whoops";
                }
                unlink($tempfile);
        }


Here is frontend use of class.

Code: [Select]
$downloadDoc = new DOCMAN_File($document->dmfilename,$_DOCMAN->getCfg('dmpath'));
$downloadDoc->download();

For now I only managed to get it working to watermark PDF file for view mode but not before download mode as attachment.
Function is working fine by itself but not when integrated in class. I'm getting really frustrated . Please help me!?!
Thank you everybody.
Al

Hey guys,

im starting out on my php journey with a small question.

I have a small uploading site and i want to allow php uploads. Once uploaded, you get a direct upload link, and i want the file to download, rather than execute.

How can this be done?

Thanks!

Hi, how much bandwidth is used for 1000 downloads per day or for each download? Is it safe to have no download limits? Thanks