Tickets :: Comment on [#5913] Lower memory usage while downloading files

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Comment	> Gollem (probably Horde as an application entirely) needs quite a > memory footprint (PHP memory_limit) for downloading mail attachments > or downloading files from Gollem. > > > > I haven't tested this problem in the latest and greatest of Horde, > but all tickets and forums I've seen indicate this is no different in > teh current release. > > > > The problem comes from the fact that the entire file that is about to > be downloaded is read entirely into memory (on the server) before it > is pushed out to the browser. This basically means that a 200MB file > stored in Gollem needs a PHP memory_limit of at least 200MB to be > able to download it. If one foreach is used on the array storing the > file in memory, the memory_limit doubles. > > > > To get around this problem is easy, push out the file in chunks, > instead of all at once. I have no idea how Gollem (or Horde) pushes > out a file to a browser, but I'd imagen it would be similar as I do > below. > > I think the below code is easy enough to read without me blabbering > on about it... Its code I use myself for a similar sort of function. > And, as far as I'm concerned, is available for Horde to use. I've > basically created the code myself using code templates for ideas I > found on various places on the net. > > Using this code, PHP's memory_limit can be left at default 8MB, and > any sized file can be downloaded. > > > > Questions? Do ask! > > > > Function ReadFileChunked ($FileName) { > > $chunksize = (102400); // how many bytes per chunk > > $buffer = ''; > > $handle = fopen($FileName, 'rb'); > > if ($handle === false) { return false; } > > while (!feof($handle)) { > > $buffer = fread($handle, $chunksize); > > print $buffer; > > } > > return fclose($handle); > > } > > > > { $File["File"] = "200MBfiletobedownloaded.zip"; > > $File["Size"] = FileSize($File["File"]); > > Header("Content-Type: application/force-download;"); > > Header("Content-Disposition: attachment; > filename=\"".$File["File"]."\""); > > Header("Content-Length: ".$File["Size"]); > > ReadFileChunked($File["File"]); > > Exit; > > } > >
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