xlsx文件在php下载中损坏

Question

I need to download xlsx file in php. The file is downloading but when i open it shows as corrupted file. I used zend Framework

Controller:

$fullPath = '/opt/bitnami/lampstack-5.4.36-0/apps/projects/ProjectName/File_Name.xlsx';

 if ($fd = fopen ($fullPath, "r")) 
 {
   $fsize = filesize($fullPath);
   $path_parts = pathinfo($fullPath);
   $ext = strtolower($path_parts["extension"]);             

   header("Content-type: application/xlsx");
   header("Content-Disposition: attachment;filename=\"".$path_parts["basename"]."\"");
   header("Content-length: $fsize");
   header("Cache-control: private");

   while(!feof($fd)) 
   {
     $buffer = fread($fd, 2048);
     echo $buffer;//To display the file content while downloaded.
    }
   }
   fclose ($fd);

View:

<?php echo $this->buffer; ?>

Other than xlsx/xls file is downloading correctly(PDF/any image file).

Answer 1

There are multiple problems than can occur and lead to this error.

First thing to do is probably to set header like this :

header('Content-Length: ' . filesize('./uploads/resources/courses/' . $filename));

and

header('Content-Transfer-Encoding: binary');

Just to be sure this is neither a header nor a filesire problem.

Often with xlsx file you'll have a BOM at the begining of the file. There is a very easy way to test out if it is the problem using unzip. Try to unzip your xlsx file and if you have something like this then this is the BOM causing the problem.

unzip -l your-file.xlsx 

You should see

warning file:  3 extra bytes at beginning or within zipfile.

You can also check with the hex viewer

head -c5 your-file.xlsx | xxd -g 1

If you have an output like this :

 0000000: ef bb bf 50 4b 

Then it's a BOM problem (notice the 3 first byte ef bb bf ).

Removing the bom (internet is full of solution for this), or encoding the file to UTF-8 should do the trick.

Hope it helped ya.

Answer 2

I found the problem. I cut and paste the code in separate controller which having downloading code only. In that time it works.

It is caused because of error occur in init function(Mapping needed controller and model files). Comment each file and check and found error in one file.

Hope this answer will help someone

Thanks for your comment.