PHP ZIP file download
Question
Here is a code which downloads attachment files from the an imap server. Almost all file types (pdf, doc, xls, etc) are being downloaded correctly, where as some zip files give the following error:
"The archive is either in unknown format or damaged"
Code:
//data from imap server
$name = "xyz 123.zip";
$type = "APPLICATION";
$subtype = "ZIP";
$encoding = "BASE64";
$body = imap_base64($data);
header('Content-Description: File Transfer');
header('Content-Type: '. $type .'/'. $subtype);
header('Content-Disposition: attachment; filename='.$name);
header('Content-Transfer-Encoding: '.$encoding);
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
ob_clean();
flush();
echo $body;
Also if I echo the data and convert it to a file using:
http://www.motobit.com/util/base64-decoder-encoder.asp
The file is being downloaded correctly. Hence no problem in getting the file from server. Where am I going wrong??
7 answers
solution1
5 2012-05-21 08:41:14
Script for downloading files in zip format: zip.php
<?php
/**
* Zip file creation class.
* Makes zip files.
*
* Last Modification and Extension By :
*
* Hasin Hayder
* HomePage : www.hasinme.info
* Email : countdraculla@gmail.com
* IDE : PHP Designer 2005
*
*
* Originally Based on :
*
* http://www.zend.com/codex.php?id=535&single=1
* By Eric Mueller <eric@themepark.com>
*
* http://www.zend.com/codex.php?id=470&single=1
* by Denis125 <webmaster@atlant.ru>
*
* a patch from Peter Listiak <mlady@users.sourceforge.net> for last modified
* date and time of the compressed file
*
* Official ZIP file format: http://www.pkware.com/appnote.txt
*
* @access public
*/
class zipfile
{
/**
* Array to store compressed data
*
* @var array $datasec
*/
var $datasec = array();
/**
* Central directory
*
* @var array $ctrl_dir
*/
var $ctrl_dir = array();
/**
* End of central directory record
*
* @var string $eof_ctrl_dir
*/
var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
/**
* Last offset position
*
* @var integer $old_offset
*/
var $old_offset = 0;
/**
* Converts an Unix timestamp to a four byte DOS date and time format (date
* in high two bytes, time in low two bytes allowing magnitude comparison).
*
* @param integer the current Unix timestamp
*
* @return integer the current date in a four byte DOS format
*
* @access private
*/
function unix2DosTime($unixtime = 0) {
$timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
if ($timearray['year'] < 1980) {
$timearray['year'] = 1980;
$timearray['mon'] = 1;
$timearray['mday'] = 1;
$timearray['hours'] = 0;
$timearray['minutes'] = 0;
$timearray['seconds'] = 0;
} // end if
return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
} // end of the 'unix2DosTime()' method
/**
*
* Function to force the download of the archive as soon as it is created
*
* @param archiveName string - name of the created archive file
* @access public
* @return ZipFile via Header
*/
public function forceDownload($archiveName) {
if(ini_get('zlib.output_compression')) {
ini_set('zlib.output_compression', 'Off');
}
// Security checks
if( $archiveName == "" ) {
echo "<html><title>Public Photo Directory - Download </title><body><BR><B>ERROR:</B> The download file was NOT SPECIFIED.</body></html>";
exit;
}
elseif ( ! file_exists( $archiveName ) ) {
echo "<html><title>Public Photo Directory - Download </title><body><BR><B>ERROR:</B> File not found.</body></html>";
exit;
}
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false);
header("Content-Type: application/zip");
header("Content-Disposition: attachment; filename=".basename($archiveName).";" );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($archiveName));
readfile("$archiveName");
}
/**
* Adds "file" to archive
*
* @param string file contents
* @param string name of the file in the archive (may contains the path)
* @param integer the current timestamp
*
* @access public
*/
function addFile($data, $name, $time = 0)
{
$name = str_replace('\\', '/', $name);
$dtime = dechex($this->unix2DosTime($time));
$hexdtime = '\x' . $dtime[6] . $dtime[7]
. '\x' . $dtime[4] . $dtime[5]
. '\x' . $dtime[2] . $dtime[3]
. '\x' . $dtime[0] . $dtime[1];
eval('$hexdtime = "' . $hexdtime . '";');
$fr = "\x50\x4b\x03\x04";
$fr .= "\x14\x00"; // ver needed to extract
$fr .= "\x00\x00"; // gen purpose bit flag
$fr .= "\x08\x00"; // compression method
$fr .= $hexdtime; // last mod time and date
// "local file header" segment
$unc_len = strlen($data);
$crc = crc32($data);
$zdata = gzcompress($data);
$zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
$c_len = strlen($zdata);
$fr .= pack('V', $crc); // crc32
$fr .= pack('V', $c_len); // compressed filesize
$fr .= pack('V', $unc_len); // uncompressed filesize
$fr .= pack('v', strlen($name)); // length of filename
$fr .= pack('v', 0); // extra field length
$fr .= $name;
// "file data" segment
$fr .= $zdata;
// "data descriptor" segment (optional but necessary if archive is not
// served as file)
$fr .= pack('V', $crc); // crc32
$fr .= pack('V', $c_len); // compressed filesize
$fr .= pack('V', $unc_len); // uncompressed filesize
// add this entry to array
$this -> datasec[] = $fr;
// now add to central directory record
$cdrec = "\x50\x4b\x01\x02";
$cdrec .= "\x00\x00"; // version made by
$cdrec .= "\x14\x00"; // version needed to extract
$cdrec .= "\x00\x00"; // gen purpose bit flag
$cdrec .= "\x08\x00"; // compression method
$cdrec .= $hexdtime; // last mod time & date
$cdrec .= pack('V', $crc); // crc32
$cdrec .= pack('V', $c_len); // compressed filesize
$cdrec .= pack('V', $unc_len); // uncompressed filesize
$cdrec .= pack('v', strlen($name) ); // length of filename
$cdrec .= pack('v', 0 ); // extra field length
$cdrec .= pack('v', 0 ); // file comment length
$cdrec .= pack('v', 0 ); // disk number start
$cdrec .= pack('v', 0 ); // internal file attributes
$cdrec .= pack('V', 32 ); // external file attributes - 'archive' bit set
$cdrec .= pack('V', $this -> old_offset ); // relative offset of local header
$this -> old_offset += strlen($fr);
$cdrec .= $name;
// optional extra field, file comment goes here
// save to central directory
$this -> ctrl_dir[] = $cdrec;
} // end of the 'addFile()' method
/**
* Dumps out file
*
* @return string the zipped file
*
* @access public
*/
function file()
{
$data = implode('', $this -> datasec);
$ctrldir = implode('', $this -> ctrl_dir);
return
$data .
$ctrldir .
$this -> eof_ctrl_dir .
pack('v', sizeof($this -> ctrl_dir)) . // total # of entries "on this disk"
pack('v', sizeof($this -> ctrl_dir)) . // total # of entries overall
pack('V', strlen($ctrldir)) . // size of central dir
pack('V', strlen($data)) . // offset to start of central dir
"\x00\x00"; // .zip file comment length
} // end of the 'file()' method
/**
* A Wrapper of original addFile Function
*
* Created By Hasin Hayder at 29th Jan, 1:29 AM
*
* @param array An Array of files with relative/absolute path to be added in Zip File
*
* @access public
*/
function addFiles($files /*Only Pass Array*/)
{
foreach($files as $file)
{
if (is_file($file)) //directory check
{
$data = implode("",file($file));
$new_file = $this->prefix_name.end(explode('/', $file));
$this->addFile($data, $new_file);
}
}
}
/**
* A Wrapper of original file Function
*
* Created By Hasin Hayder at 29th Jan, 1:29 AM
*
* @param string Output file name
*
* @access public
*/
function output($file)
{
$fp=fopen($file,"w");
fwrite($fp,$this->file());
fclose($fp);
}
} // end of the 'zipfile' class
?>
Example usage:
<?php
include_once('zip.php');
$zip_file = 'my_files.zip'; // name for downloaded zip file
$ziper = new zipfile();
$ziper->prefix_name = 'folder/'; // here you create folder which will contain downloaded files
$ziper->addFiles($files_to_zip); // array of files
$ziper->output($zip_file);
$ziper->forceDownload($zip_file);
@unlink($zip_file);
?>
solution2
1 2015-09-12 10:03:09
I might be a little late but I faced the same problem and these lines worked like a charm for me
while (ob_get_level()) {
ob_end_clean();
}
solution3
0 2012-05-22 07:17:09
The culprit was imap_base64. It was not decoding the data correctly. I replaced it with base64_decode as follows and the code worked fine.
$body = base64_encode($data);
solution4
0 2015-07-07 02:25:09
You're very close to the solution! I found the way to solve this was to remove the Content-type header all together and let the browser figure out that this was a .zip file. Remove the Content-Type and it should work as needed.
// Remove this line
header('Content-Type: '. $type .'/'. $subtype);
In my console (Chrome) I was receiving a strange message(s) saying:
Resource interpreted as Document but transferred with MIME type application/octet-stream:
Resource interpreted as Document but transferred with MIME type application/zip:
When I removed the MIME Type (Content-type header) the .zip stopped giving me an error and worked normally.
The most basic download script for making the .zip to work looked like this at the end: (note: You can still add more headers for caching and such)
<?php
header("Content-Disposition: attachment; filename=\"".$Filename."\"");
header("Content-Length: ".filesize($Filename));
readfile($Filename);
?>
Edited
Your .zip's will also run into problems if the browser is reading extra spaces. You can prevent the extra spaces at the end of the readfile() by adding exit(); but you'll want to make sure you don't have any spaces at the start of the file. This is particularly common when dealing with frameworks (especially your own). A little trick: If you include all the functions, configs and classes before your buffer starts outputting HTML, view your source code. At the start there will be a space before the .
solution5
0 2015-09-12 10:13:05
It Worked For Me. It Download My .Zip File. But, you have to provide the full path of File, where it is located.
For ex: My File is inside assets/upload Folder. Attach name of that file with this location. You will download it without any problem.
$FilePaths='assets/Upload/'.$FileName; //Give proper file path with file name.
download_file($FilePaths);
function download_file( $fullPath )
{
if( headers_sent() )
die('Headers Sent');
if(ini_get('zlib.output_compression'))
ini_set('zlib.output_compression', 'Off');
if( file_exists($fullPath) )
{
$fsize = filesize($fullPath);
$path_parts = pathinfo($fullPath);
$ext = strtolower($path_parts["extension"]);
switch ($ext)
{
case "pdf": $ctype="application/pdf"; break;
case "exe": $ctype="application/octet-stream"; break;
case "zip": $ctype="application/zip"; break;
case "doc": $ctype="application/msword"; break;
case "xls": $ctype="application/vnd.ms-excel"; break;
case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
case "gif": $ctype="image/gif"; break;
case "png": $ctype="image/png"; break;
case "jpeg":
case "jpg": $ctype="image/jpg"; break;
default: $ctype="application/force-download";
}
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false);
header("Content-Type: $ctype");
header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".$fsize);
ob_clean();
flush();
readfile( $fullPath );
}
else
die('File Not Found');
}
For more info, Check this File Download
solution6
0 2017-01-25 16:10:46
I didn't see anyone mention this yet, but try removing the Content-Length header when download ZIP files. I had this exact same problem and it worked for
solution7
-1 2012-05-21 08:43:48
This is really good for big file download. User will be receiving file immediately. Maybe zip will be correct too this way.
if(file_exists($filename) && is_readable($filename) && file_exists($filename)){
header("Content-Disposition: attachment; filename=".basename(str_replace(' ', '_', $filename)));
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");
header("Content-Description: File Transfer");
header("Content-Length: " . filesize($filename));
flush(); // this doesn't really matter.
$fp = fopen($filename, "r");
while (!feof($fp))
{
echo fread($fp, 65536);
flush(); // this is essential for large downloads
}
fclose($fp);
exit;
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.