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Что значят "?" и ":" в выражении?


Mal4ishnik
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Есть такое выражение:

$counter = isset($a) ? $a: 0;

Что здесь значат "?" и ":"? Выражение из книги "PHP 5" Котерова, взятое из середины книги. Искал искал что это значит не нашел, судя по всему некое иф-элсе.

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