This additional header is "Transfer-Encoding: chunked" which essentially overrides the "Content-Length" header and forces a chunked download. Of course, this is not required if you are using the intelligent versions of readfile in this article.
A missing Content-Length header implies the following: 1 Your browser will not show a progress bar on downloads because it doesn't know their length 2 If you output anything e. The easiest way to disable this behaviour is with the following. SetEnv no-gzip dont-vary. Beware - the chunky readfile suggested by Rob Funk can easily exceed you maximum script execution time 30 seconds by default. I think that readfile suffers from the maximum script execution time.
The readfile is always completed even if it exceed the default 30 seconds limit, then the script is aborted. Be warned that you can get very odd behaviour not only on large files, but also on small files if the user has a slow connection. To use readfile it is absolutely necessary to set the mime-type before. If you are using an Apache, it's quite simple to figure out the correct mime type.
Apache has a file called "mime. Cheers Philipp Heckel. Elliott Brueggeman What's the point of a user's settings if not to determine their environment? If they have it set a specific way, honor their setting. I didn't benchmark further, but I'd be willing to bet non-mmap'able streams still win because they can loop in C instead of PHP. I wasted days trying to figure this out before I found the problem was easily solved. I'm sure many of you out there have had similar problem when trying to use readfile to output images with a php file as the "src" of a "img" tag.
Not worked for me. K-Gun Marek Sebera Marek Sebera 38k 34 34 gold badges silver badges bronze badges. But adds ' to the stored filename. Not working dear in case of png image for me. Show 1 more comment. Fabio: Will add more detials — genesis. That was super easy. It worked. Just curious. Just remove 'echo' prior to 'readfile ' since the return value is specified as "Returns the number of bytes read from the file. If an error occurs, FALSE is returned and unless the function was called as readfile , an error message is printed.
Display your file first and set its value into url. Where did you get this from? It seems powerful — Axel A. This is working for a very big file also. Great solution. Parziphal Parziphal 4, 3 3 gold badges 31 31 silver badges 30 30 bronze badges. I just tried this and it killed my server. Wrote a massive number of errors to my logs.
It would be useful to know what the logs were about. Yeah sorry, the log file got so big I had to just nuke it, so I didn't get to see.
I did my best to provide only accurate information. It would be truly sad for me if an article about avoiding common PHP errors contained errors itself.
Regardless, my point stands: PHP makes it easy to hack together code that appears to be working, but developers should read and adhere to the official specifications. Great post. Im having issues though. Im trying to get the remote files with using headers but it kills the ability for the user to be able to stream the podcast. BTW I found this post that was exactly what i needed and works great! It sends a bogus error if the range is not accepted and sends the full file size as the content length rather than just the length of the range.
Now, browsers are probably coded to cope with all sorts of errors, but we should strive to write correct code, not just working code. This method works for now and I plane to develop a better functioning version of this. Share on facebook. Share on twitter. Share on linkedin. Just another reason to switch to an nginx-based solution. I think lighty has supported it for a long time too.
Then they should move away from shared hosts. Sure they should move away, but many of them stick with shared hosting because of the higher costs for managed server hosting. Hi, i used your code to create a download. I would like to protect also my folder from url access, if i use as chmod value, the page will not return the download file, but it will stay blank the fopen fail..
Which value should i use for access files from the code? Or protect your directory via. Does the download work with regular permissions? I deny the access to the folder. The script gave me an empty file. Do you use the windows versions? The file is opened in corrupted format. Do you checked the file size for the downloaded file?
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