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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