Over at BigBlueHat there is an interesting blog post about using the ?> at the end of php files. While personally I don’t use it on scripts that contain just php code, but I can see where both sides are coming from.
What the…?> PHP and unwanted whitespace
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Having been bitten by this before, I can appreciate how important this piece of advice is. If you are including a library with 20+ files in it and 1 of those files ends with “?>[space]” you’ll get the headers cannot be send error. Good luck finding out which file does it.