File Upload and Download with PHP
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How to download pdf file in php with example
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Check compatibility here: Don't loop through every file line. Click here to download PDF. You can modify this and add fpassthru instead of fread and while, but it sends all data from begin --- it would be not fruitful if request is bytes from 100 to 200 from 100mb file.
It is an easy to use force file download script, useful for sites that have different files and would like force people to download the files instead of social them run remotely off their web server. XLS, or external program files. PHP Create File - fopen The fopen function is also used to create a file. So this is the proper chunked readfile which isn't really readfile at all, and should probably be crossposted to passthrufopenand popen con so browsers can find this information : All I've added is a flush ; after the echo line. Instead of linking to the. We remove all uploaded files frequently.
If you use proper MIME types and inline Content-Disposition , browsers will have better default actions for some of them. This opens up a major security hole if you are passing the actual filename using GET or POST form data or anything else that the user can spoof. The readfile is always completed even if it exceed the default 30 seconds limit, then the script is aborted.
Example with MySQL - Use this or another function to get a list of mime-types: If you do not want to read from the mime. The best thing to do is to use just before the readfile, to disable completely the watchdog if you intend to use the readfile call to tranfer a file to the user.
I've seen a number of methods to force file downloads using the PHP header function which, essentially, sends a raw HTTP header to the browser. Depending on your browser, some files won't be downloaded automatically. Instead, they will be handled by the browser itself or a corresponding plug-in. This is often an issue with PDF files, TXT files, CSV files, LOG files, multimedia files MP3, WAV, MOV, MPEG, AVI, etc. As a developer, being able to force the download of any type of file is extremely useful. To Force, Or Not To Force? In some cases it is appropriate while in others it is probably not. It has been a convenience the many times I have used it to push CSV files out to end users who wouldn't know enough to copy and paste the data from the browser window into a file and then save it. It is also handy for when you generate PDF files and want to push them to the user as a download rather than have it open up inside the browser window. Not only does this make the PDF easier for the user to download, it also provides consistency for the way downloads are handled regardless of what browser plug-ins the user has installed. Again, in some cases it is appropriate to force a download, in others it is not. The Force Download Script After rigorous browser testing and code tweaking, here is the script I ended up with. All of the unnecessary stuff has been stripped out and it has been simplified as much as possible. Users who are directed to the script will be prompted to download the appropriate file regardless of their browser and plug-in settings. The PHP readfile function reads files verbatim, including PHP files. This opens up a major security hole if you are passing the actual filename using GET or POST form data or anything else that the user can spoof. A curious user could easily gain access to sensitive database connection information or other system data by entering something like? You should always use some kind of identifier to prevent unauthorized access to sensitive information. Browser Issues Safari and Filenames Surprisingly, all of the force-download scripts I researched online failed to work properly in Safari. The download occurred, but the resulting file was named after the script i. If I renamed the downloaded file to its correct name, it would open just fine. This, however, was a terrible inconvenience. A bit of testing revealed the culprit. Caching Problems Many of the scripts I found included header calls to tell the browser not to use a cached version of the file. Caching wasn't an issue with any of the browsers I tested, but if it becomes problematic, add the following lines to the script above the call to readfile. Internet Explorer was not able to open this Internet site. The requested site is either unavailable or cannot be found. Please try again later. To get around this, whenever you are forcing a download over HTTPS append the following two lines of code to the force download script above the call to readfile.