如何在PHP 5.2中计算月份+天的人的年龄？

function calculateAge($birthMonth, $birthDay) {
    // 获取当前日期
    $today = date("Y-m-d");
    // 计算出生日期
    $birthDate = date("Y-m-d", strtotime("-$birthMonth months -$birthDay days"));
    // 计算时间差
    $diff = abs(strtotime($today) - strtotime($birthDate));
    // 将时间差转换为年、月和日
    $years = floor($diff / (365*60*60*24));
    $months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24));
    $days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24) / (60*60*24));
    // 计算年龄
    $age = $years;
    if ($months > 0 || $days > 0) {
        $age += 1;
    }
    return $age;
}

// 示例
$birthMonth = 5;
$birthDay = 15;
$age = calculateAge($birthMonth, $birthDay);
echo "年龄：$age 岁";