The above file will be downloaded through browser and browser will give you an option to save the file. If you want to save the file directly through code only then you can use the following code instead of sending any header to the browser:. Now I will show you the code that will download file in chunk size using fpassthru function. Start the development server, navigate to the root folder of your project from the command line tool and execute the command: php -S localhost You can also check how to run PHP application without external server.
This code is slightly strange. We open handles to both files, the first in read mode and the second in write mode. Then we copy from the first into the second. We finish by closing both files again. It may surprise you to know that the memory used is KB. That seems familiar. Suppose we wanted to output an image from our CDN, as a sort of redirected application route.
We could illustrate it with code resembling the following:. Imagine an application route brought us to this code.
But instead of serving up a file from the local file system, we want to get it from a CDN. The memory usage for this image is around KB. Now, how about we try to stream this instead? The memory usage is slightly less at KB , but the result is the same.
In fact, PHP provides a simple way to do this:. Imagine we wanted to compress our shakespeare. This is a guide to PHP readfile. Here we discuss the introduction, methods, and examples of php readfile along with code implementations. You may also have a look at the following articles to learn more —.
Submit Next Question. By signing up, you agree to our Terms of Use and Privacy Policy. Forgot Password? This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy. Popular Course in this category. A context stream resource. Returns the number of bytes read from the file on success, or false on failure.
Example 1 Forcing a download using readfile. Note : readfile will not present any memory issues, even when sending large files, on its own. A URL can be used as a filename with this function if the fopen wrappers have been enabled. See fopen for more details on how to specify the filename. See the Supported Protocols and Wrappers for links to information about what abilities the various wrappers have, notes on their usage, and information on any predefined variables they may provide.
Submit a Pull Request Report a Bug. Parameters filename The filename being read. Return Values Returns the number of bytes read from the file on success, or false on failure.
Notes Note : readfile will not present any memory issues, even when sending large files, on its own. Tip A URL can be used as a filename with this function if the fopen wrappers have been enabled. Just a note for those who face problems on names containing spaces e.
It does work, but you may encounter memory exhaustion using "fread". It does not mean that you can fully escape memory exhaustion, though: if you are reading too much at a time, you can still encounter it. That is why in my library I use a helper function "speedLimit" to calculate whether selected speed limit will fit the available memory while allowing some headroom.
You can read comments in the code itself for more details and raise issues for the library, if you think something is incorrect there especially since it's WIP at the moment of writing this , but so far I am able to get consistent behavior with it. To avoid the risk of choosing themselves which files to download by messing with the request and doing things like inserting "..
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