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.
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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.
注: Context support was added with PHP 5.0.0. For a description of contexts, refer to 參考 CLIII, Stream Functions.
See also fpassthru(), file(), fopen(), include(), require(), virtual(), file_get_contents(), and 附錄 M.