Description:
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I use include to include html parts in the page.
The function adds an invisible character in the head portion (from a check it looks like an ascii code (63) which actually graphically lowers .
I don't know how many pixels lower than the code without the function include...
To be clearer (I'm Italian and I may not be able to explain myself correctly) in the code I include there is an html page header div (which I use for each page).
If I use that code directly on the php page the display is correct, but if I include it with the include or require function from another page, the div is about twenty pixels lower.
Analyzing the code, an ascii character (63) is in the head which is not actually present.

Test script:
---------------
<body>
<?php include_once 'HtmlPage.inc'; ?>
</body>
.......................................................
HtmlPage.inc:
<div style="width: 300px; height: 400px; background-color: #FF6666;">Intestazione</div>
====================================================================
rispetto a:
<body>
  <div style="width: 300px; height: 400px; background-color: #FF6666;">Intestazione</div>
</body>