How to include files with die(); function?

If I understand correctly what you are trying to do then unfortunately it isn't possible.

die(); will stop the script from executing at the point from where it is called.

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If you would like to test whether the includes happened successfully, you can test the return value of the include function itself:

// http://us3.php.net/manual/en/function.include.php Example #4
if ((include 'file1.php') != 'OK') {
    die();
}

You may also consider require() instead of include() depending on your needs:

require() is identical to include() except upon failure it will also produce a fatal E_ERROR level error. In other words, it will halt the script whereas include() only emits a warning (E_WARNING) which allows the script to continue.

Here is how to include a file, or die with a message if the include fails code sample.

(include('file.php')) || die('Failed to include file!');