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Can someone help me understand parentheses structure? Why here does the second empty() have no parentheses before it and an extra parentheses at the end? if (empty($subject) && empty($text)) { .... And here, why is there an extra parentheses at the end? if (empty($subject) && (!empty($text))) { ... And here, why double parentheses in the 1st empty() and none before the 2nd empty() ? if ((!empty($subject)) && empty($text)) { ... Thank You! michael