ReadFile fetches the data (complete XML file) that we want to encrypt.

ReadFile取得我们希望加密的数据(整个XML文件)。

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The readfile function dumps the entire contents of a file or Web page to the default output buffer.

readfile 函数将把文件或 Web 页面的全部内容转储到默认的输出缓冲区。

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As with fopen, file_get_contents, file, and readfile, all return False on failure to open or process the file.

如fopen函数一样，file_get _ contents、file和readfile函数都在打开失败或处理文件失败时返回False。

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