Strange php problem [closed]

Closed. This开发者_如何学Python question is not reproducible or was caused by typos. It is not currently accepting answers.

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This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.

Closed 8 years ago.

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The following code:

print_r($_GET);
echo '<br />';
echo isset($_GET['logout'])?'yes':'no';

prints:

Array ( [logoout] => )
no

Why is it printing "no" instend of "yes"?

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logoout - double "o"