Ok, you're getting into semantics now. http://www.php.net/manual/en/language.basic-syntax.php doesn't say whether it is acceptable or not, but as Robert pointed out, if your script is purely php, omitting it is a good way of eliminating the headache of trailing white spaces that may interfere with headers.
No, I'm getting into the reality that an undocumented feature may very well be a bug, and may disappear.
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