When building websites or web apps, creating a “Download as file” link is quite useful. For example if you want to allow user to export some. A URL can be used as a filename with this function if the fopen wrappers have been enabled. See fopen() User Contributed Notes 34 notes. up · down Most if not all browsers will simply download files with that type. If you use just be careful whether slash "/" is allowed or not at the beginning of $file_name parameter. After a user grants a web app access, this API allows them to read or save changes directly to The core file system interactions are in fs-helpers.js. albeit this will trigger a programmatic download and not allow for overwriting existing files.
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readfile
(PHP 4, PHP 5, PHP 7)
readfile — Outputs a file
Description
readfile ( string [, bool = [, resource ]] ) : int|false
Reads a file and writes it to the output buffer.
Parameters
The filename being read.
You can use the optional second parameter and set it to , if you want to search for the file in the include_path, too.
A context stream resource.
Return Values
Returns the number of bytes read from the file on success, or on failure
Errors/Exceptions
Upon failure, an is emitted.
Examples
Example #1 Forcing a download using readfile()
The above example will output something similar to:
Notes
Note:
readfile() will not present any memory issues, even when sending large files, on its own. If you encounter an out of memory error ensure that output buffering is off with ob_get_level().
TipA 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.
Note: Context support was added with PHP 5.0.0. For a description of , refer to Streams.
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