readfile
(PHP 4, PHP 5)
readfile — Outputs a file
Description
int readfile
( string $filename
[, bool $use_include_path
[, resource $context
]] )
Reads a file and writes it to the output buffer.
Parameters
- filename
-
The filename being read.
- use_include_path
-
You can use the optional second parameter and set it to TRUE, if you want to search for the file in the include_path, too.
- context
-
A context stream resource.
Return Values
Returns the number of bytes read from the file. If an error occurs, FALSE is returned and unless the function was called as @readfile(), an error message is printed.
Notes
Tip
如果 fopen wrappers 已啟動，則可藉此函數把檔名當成URL使用。參考 fopen() 有更多關於如何指定檔名的細節和List of Supported Protocols/Wrappers支援URL協定的列表。
Note: Context support was added with PHP 5.0.0. For a description of contexts, refer to Streams.