Тэги PHP-кода

Всегда используйте <?php ?> вместо <? ?>для выделения PHP-кода. Это необходимо для обеспечения работы PEAR на разных операционных системах и с различными настройками.

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Last updated: Wed, 25 Nov 2015 — Download Documentation
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User Notes:

Note by: qwerty@cqproject.net
What about <?= ?> and <?php= ?> ?
Note by: pear@ontheroad.net.nz
It's applicable in any script which ends with PHP code, e.g.

// Something here

<div>Some HTML here</div>
// Some other code here?>
Note by: julian@gmail.com
Not including the closing ?> is only applicable when the file only contains PHP code.
Note by: pear at alan hogan.com
Drupal code styles suggest avoiding the final closing ?>.

They do so as to minimize the chance of content being sent by whitespace (sometimes inserted by FTP clients) after the closing town, which may prevent proper sending of headers.

Does PEAR care either way? Is it OK to avoid the final closing PHP tag?