PHP：用浮点数计算完整年龄

我想用浮点数计算年龄，例如2.5岁，35.25岁

$bday = new DateTime('11.4.1987'); // Your date of birth
$today = new Datetime(date('m.d.y'));
$diff = $today->diff($bday);
printf(' Your age : %d years, %d month, %d days', $diff->y, $diff->m, $diff->d);

给出输出：您的年龄：30岁，3个月，0天

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有什么办法可以把它转换成30.25或30.50，只要把你的月份除以总月份数：

$diff->m/12

$bday = new DateTime('11.4.1987'); // Your date of birth
$today = new Datetime(date('m.d.y'));
$diff = $today->diff($bday);
echo sprintf(' Your age : %d years, %d month, %d days.', $diff->y, $diff->m, $diff->d);
echo sprintf(' It is %d.%d years', $diff->y, ($diff->m/12)*100);
// will return
// Your age : 32 years, 2 month, 24 days. It is 32.16 years

// OR
echo sprintf(' It is %.2f years', $diff->y + $diff->m/12);
// It is 32.17 years

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到目前为止你试过什么？你被困在哪里？是否有更明确的要求？旁注：

newdatetime（'11.4.1987'

）。