A force-download script can give you more control over a file download than you would have Learn how to force a download using PHP, a BluDice article. You can successfully open up the desired word doc or pdf. This can apply to images, pdfs, html, anything a web browser can open How to Force the Download of a File with HTTP Headers and PHP. I've seen a number of methods to force file downloads using the PHP This is often an issue with PDF files, TXT files, CSV files, LOG files.
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In this tutorial you will learn how to force download a file using PHP. Normally, you don't necessarily need to use any server side scripting language like PHP to download images, zip files, pdf documents, exe files, etc. You can force images or other kind of files to download. Read the docs about built-in PHP function readfile $file_url Also make sure to add proper content type based on your file application/zip, application/pdf etc. Assuming the file exists on the file server and there is a path to access it, if we try to open the file in today's modern browsers, most of them.
Just curious. 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. I have a link on my site to a script that outputs an XML file to the browser with the below code: Sure they should move away, but many of them stick with shared hosting because of the higher costs for managed server hosting. You might also be interested in adding something like:
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.
I have a link on my site to a script that outputs an XML file to the browser with the below code: 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.
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. It works fine "as is" in Firefox but not in IE, Safari or g. I found hundreds of results on google all saying things like "there must be white space at the end of you code", "you need this header or that header".
I couldn't believe what the solution was but here it is anyway! Remove the "Width" and "Height" attributes from your "img" tag.
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".
Beware - the chunky readfile suggested by Rob Funk can easily exceed you maximum script execution time 30 seconds by default. 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.
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: 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: The easiest way to disable this behaviour is with the following.
SetEnv no-gzip dont-vary. 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. 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. Use this or another function to get a list of mime-types: Cheers Philipp Heckel. Beware of using download managers.. I was trying to use readfile in IE8 and kept getting the message "failed to get data for 'type'".
Eventually figured out the problem was that I had LeechGet installed and it was intercepting the download, which in turn prevented the download from taking place. In response to "grey - greywyvern - com": If the user manages to set the target to some kinda config-file configuration. Using include will just behave as a normal request no output.
For remote files however use readfile. Do you use the windows versions? Cannot modify header information — headers already sent by output started at C: Line The file is opened in corrupted format. Do you checked the file size for the downloaded file? Open the file in your text editor, most of the time you can see an error message.
Solve the the reported problem. Otherwise check also your PHP error log. Thanks for the reply. But PDF, image file, txt file will download correctly for same code. I create a seperate controller for only download action. So i find that it occur because of some other code affecting file. The bad thing is that headers work different for different server configurations. I delete all comments with non related links inside the comment text. Don't use keywords for the field of your real name most people like to use your name for their answer.
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The download works with regular permission. Thanks in advance. Hi, sounds like a problem with headers, does the same script works for you in browsers like Chrome and Firefox? Hi Bobic, like the warning said your script started the output at row 9.