为什么我的下载文件总是损坏或损坏? [英] Why is my downloaded file is always damaged or corrupted?
问题描述
我的下载脚本有一个很奇怪的问题
基本上
1.使用"GET"方法获取文件ID
2.从数据库中获取该文件的名称和位置
3.使用标头和readfile将其发送到客户端
但是奇怪的是，该文件总是以损坏或损坏的形式出现
就像是zip或rar文件一样 文件大小正确，可以打开
但是我无法打开其中的压缩文件，这就是我收到文件损坏的错误
如果代码有问题，这是很奇怪的，我什至不能打开zip文件(或者至少我认为我不应该)
另一件事是，在发送标题之前，我已经打印出了带有路径的文件，只是为了确保一切正常
我已经将文件地址放在url上并下载了文件，文件没问题，没有错误
所以在发送标题之前一切都很好
这是我的代码
$file_id = isset($_GET['id']) && (int)$_GET['id'] != 0 ? (int)$_GET['id'] : exit;
//////// finging file info
$file = comon::get_all_by_condition('files' , 'id' , $file_id );
if(!$file) exit;
foreach($file as $file){
$location = $file['location'];
$filename = $file['file_name'];
}
/////////////
$site = comon::get_site_domian();
$ext = trim(end(explode('.' , $filename )));
$abslout_path = 'http://'.$site.'/'.$location.'/'.$filename;
$relative = $location.'/'.$filename;
////////////////// content type
switch($ext) {
case 'txt':
$cType = 'text/plain';
break;
case 'pdf':
$cType = 'application/pdf';
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:
$cType = 'application/force-download';
break;
}
//////////////// just checking
if(!file_exists($relative)){
echo $relative;
echo '<br />';
exit;
}
if( !is_readable( $relative ) )
exit('its not redable');
if( headers_sent() )
exit('headers ? already sent !! ');
header( 'Pragma: public' );
header( 'Expires: 0' );
header( 'Cache-Control: must-revalidate, post-check=0, pre-check=0' );
header( 'Cache-Control: private', false ); // required for certain browsers
header( 'Content-Description:File Transfer' );
header($_SERVER['SERVER_PROTOCOL'].' 200 OK');
header( 'Content-Type:'.$cType);
header( 'Content-Disposition: attachment; filename="'. basename($filename) . '";' );
header( 'Content-Transfer-Encoding: binary' );
header( 'Content-Length: ' . filesize($relative) );
readfile($abslout_path);
exit;
我已经检查了头文件几次，它们很好(我认为)，我还要添加人类已知的每个头文件，以确保！
我开始认为也许是脚本以外的东西 像char编码或文件夹权限！或类似的东西！
我错过了什么吗?
这似乎是为了强制下载而分配的代码，这是我一直使用的好函数.它也将处理超过2GB的文件.
<?php
$file_id = (isset($_GET['id']) && (int)$_GET['id'] != 0) ? (int)$_GET['id'] : exit;
/*finding file info*/
$file = comon::get_all_by_condition('files', 'id', $file_id);
$path = $file['location'] . '/' . $file['file_name'];
if (!is_file($path)) {
echo 'File not found.('.$path.')';
} elseif (is_dir($path)) {
echo 'Cannot download folder.';
} else {
send_download($path);
}
return;
//The function with example headers
function send_download($file) {
$basename = basename($file);
$length = sprintf("%u", filesize($file));
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="' . $basename . '"');
header('Content-Transfer-Encoding: binary');
header('Connection: Keep-Alive');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . $length);
set_time_limit(0);
readfile($file);
}
?>
I have a very weird problem with my download script
it basically
1.gets a file id with "GET" method
2.gets the name and location of that file from database
3.sends it to the client with the headers and readfile
but strangely that file always comes out as corrupted or damaged
like if it's a zip or rar file file size is right and it opens ok
but i cant open compressed files inside of it and that's when i get the file damaged error
which is weird cuz if the code had a problem i shouldn't even be able to open the zip file(or at least i think i shouldn't)
another thing is i've printed out the file with it's path right before sending the headers just to be sure everything is ok
I've put the file address on the url and download the file , file was ok with no errors
so everything is fine before sending the headers
here is my code
$file_id = isset($_GET['id']) && (int)$_GET['id'] != 0 ? (int)$_GET['id'] : exit;
//////// finging file info
$file = comon::get_all_by_condition('files' , 'id' , $file_id );
if(!$file) exit;
foreach($file as $file){
$location = $file['location'];
$filename = $file['file_name'];
}
/////////////
$site = comon::get_site_domian();
$ext = trim(end(explode('.' , $filename )));
$abslout_path = 'http://'.$site.'/'.$location.'/'.$filename;
$relative = $location.'/'.$filename;
////////////////// content type
switch($ext) {
case 'txt':
$cType = 'text/plain';
break;
case 'pdf':
$cType = 'application/pdf';
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:
$cType = 'application/force-download';
break;
}
//////////////// just checking
if(!file_exists($relative)){
echo $relative;
echo '<br />';
exit;
}
if( !is_readable( $relative ) )
exit('its not redable');
if( headers_sent() )
exit('headers ? already sent !! ');
header( 'Pragma: public' );
header( 'Expires: 0' );
header( 'Cache-Control: must-revalidate, post-check=0, pre-check=0' );
header( 'Cache-Control: private', false ); // required for certain browsers
header( 'Content-Description:File Transfer' );
header($_SERVER['SERVER_PROTOCOL'].' 200 OK');
header( 'Content-Type:'.$cType);
header( 'Content-Disposition: attachment; filename="'. basename($filename) . '";' );
header( 'Content-Transfer-Encoding: binary' );
header( 'Content-Length: ' . filesize($relative) );
readfile($abslout_path);
exit;
I've checked the headers couple times and they are fine(i think) , I've also add every headers known to man just to be sure !
I'm starting to think maybe it's something other than script like char encoding or folder permission ! or something like that !!
am i missing something ?
That seems allot of code just to force-download, here is a nice function I use all the time. It will handle files over 2GB too.
<?php
$file_id = (isset($_GET['id']) && (int)$_GET['id'] != 0) ? (int)$_GET['id'] : exit;
/*finding file info*/
$file = comon::get_all_by_condition('files', 'id', $file_id);
$path = $file['location'] . '/' . $file['file_name'];
if (!is_file($path)) {
echo 'File not found.('.$path.')';
} elseif (is_dir($path)) {
echo 'Cannot download folder.';
} else {
send_download($path);
}
return;
//The function with example headers
function send_download($file) {
$basename = basename($file);
$length = sprintf("%u", filesize($file));
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="' . $basename . '"');
header('Content-Transfer-Encoding: binary');
header('Connection: Keep-Alive');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . $length);
set_time_limit(0);
readfile($file);
}
?>
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