readfile
(PHP 4, PHP 5)
readfile — Outputs a file
說明
int readfile
( string $filename
[, bool $use_include_path
[, resource $context
]] )
Reads a file and writes it to the output buffer.
參數
- 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值
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.
註釋
Tip
如果「fopen wrappers」已經被啟用,則在本函式中可以把 URL 作為檔案名來使用。請參閱 fopen() 函式來獲取如何指定文件名的詳情以及支援 URL 協定列表:List of Supported Protocols/Wrappers。
Note: 對 context 的支援是 PHP 5.0.0 增加的。有關 context 的說明見Streams。