PHP根据生日计算年龄（周岁）

<?php/*** 根据时间戳计算年龄* @param $birth* @return mixed*/function howOld($birth) {list($birthYear, $birthMonth, $birthDay) = explode('-', date('Y-m-d', $birth));list($currentYear, $currentMonth, $currentDay) = explode('-', date('Y-m-d'));$age = $currentYear - $birthYear - 1;if($currentMonth > $birthMonth || $currentMonth == $birthMonth && $currentDay >= $birthDay)$age++;return $age;}?>

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