Related questions about ReadFile and file_get_conents

Questions about ReadFile and file_get_conents
Cases

echo File Get contents ("http://www.csdn.net/")

What is the process of ReadFile and file_get_conents, please?

Remote server-----> Local-----> Client

Still is

Remote Server-----> Client


If the remote file is downloaded to local and then sent to the client is not to occupy the resources of the local server?

Is there a way to pass the client's request directly to the client directly from the remote receiver? (Requirement: Hide the URL of the remote server)

------Solution--------------------
First, correct the file_get_contents.

PHP is running on the server side of what do you say is the process?

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If the remote file is downloaded to local and then sent to the client is not to occupy the resources of the local server?

Is there a way to pass the client's request directly to the client directly from the remote receiver? (Requirement: Hide the URL of the remote server)

It is not possible to work on the server side without consuming resources.
The client's request is passed directly to the client? Remote server URL? That is to do the desktop program, let the client run a PHP environment, or
This effect can be achieved by using JS and Ajax mates for processing.

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