It's because the writers have left out the all important flush after each read. Be sure to include this! This was the only way I found to both protect and transfer very large files with PHP gigabytes. It's also proved to be much faster for basically any file.
Available directives have changed since the other note on this and XSendFileAllowAbove was replaced with XSendFilePath to allow more control over access to files outside of webroot. Download the source. Using pieces of the forced download script, adding in MySQL database functions, and hiding the file location for security was what we needed for downloading wmv files from our members creations without prompting Media player as well as secure the file itself and use only database queries.
Something to the effect below, very customizable for private access, remote files, and keeping order of your online media. Of course you need to setup the DB, table, and columns.
If you are looking for an algorithm that will allow you to download force download a big file, may this one will help you. I have seen a lot of download scripts that does not test so you are able to download anything you want on the server. Test especially for strings like ".. If possible only permit characters a-z, A-Z and and make it possible to only download from one "download-folder". If you are using the procedures outlined in this article to force sending a file to a user, you may find that the "Content-Length" header is not being sent on some servers.
The reason this occurs is because some servers are setup by default to enable gzip compression, which sends an additional header for such operations. 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. However, if this setting is checked, and browser windows are being re-used, then it will open up on top of the page where the link was clicked to access the script.
But, if the setting is unchecked, the output XML file will open up in a new window and there will be another blank window also open that has the address of the script, in addition to our original window. This is far from ideal, and there is no way of knowing whether users have this option checked or not.
But there are some headers, which PHP itself outputs automatically, disturbing this. So I wrote this function with erasing these.
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. Improve this question. Rupesh Arora Rupesh Arora 2 2 gold badges 8 8 silver badges 26 26 bronze badges. Add a comment. Sorted by: Reset to default. Highest score default Trending recent votes count more Date modified newest first Date created oldest first.
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|Download pdf file in php code||See the Supported Protocols and Wrappers for links to information about what abilities the various wrappers have, notes on their usage, and information dlwnload any predefined variables they may provide. I'm sure many of you out ;df have had similar problem when trying to use readfile to palladium books download free images with a php file as the "src" of a "img" tag. The Overflow Blog. When user clicks the link server will send the file to the browser. Accept all cookies Customize settings. Linked 0.|
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