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readfile
(PHP 4, PHP 5, PHP 7)
readfile — Outputs a file
Description
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().
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.
Note: Context support was added with PHP 5.0.0. For a description of , refer to Streams.
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