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# readfile

(PHP 3, 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.

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.

> 提示: 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附錄 L支援URL協定的列表。

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.

See also fpassthru(), file(), fopen(), include(), require(), virtual(), file_get_contents(), and 附錄 L.

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