PHP Include

I made a index.php file with following code:

<?php
include('header.php');
?>

Text comes here

<?php
include('footer.php');

?>

Now I get following errors:

Warning: Failed opening 'header.php' for inclusion (include_path='') in e:\index.php on line 2

Text comes here

Warning: Failed opening 'footer.php' for inclusion (include_path='') in e:\index.php on line 8

What do I wrong?

Try:

<?php
include('e:\header.php');
?>

Text comes here

<?php
include('e:\footer.php');
?>

Header.php and footer.php are not in the same directory as the script itself.
You may have to specify where header.php and footer.php are located:

include('/pah/to/header.php');

So it means that I always should mention the path, even if index.php, header.php and footer.php remain on the same directory ??

Not if they are all in the same directory, only if they are not in the same directory.

Also, make sure that the webserver has read-access to the scripts.