我们如何在PHP中添加两个日期间隔

Question

我想添加两个日期间隔来计算小时和分钟的总持续时间,实际上我想要执行addittion,如下所示:

$a = new DateTime('14:25');
$b = new DateTime('17:30');
$interval1 = $a->diff($b);
echo "interval 1 : " . $interval1->format("%H:%I");
echo "<br />";

$c = new DateTime('08:00');
$d = new DateTime('13:00');
$interval2 = $c->diff($d);
echo "interval 2 : " . $interval2->format("%H:%I");
echo "<br />";

echo "Total interval : " . $interval1 + $interval2;

任何想法如何执行这种类型的间隔添加,以获得PHP中的总小时和分钟格式的两个间隔的总和

Answer 1

PHP没有运算符重载*因此+对象使PHP尝试将它们首先转换为字符串,但DateInterval不支持:

interval 1: 03:05
interval 2: 05:00
Total interval : 08:05

相反,您需要创建一个新DateTime对象,然后使用该add函数添加间隔,最后显示与参考点的差异:

$e = new DateTime('00:00');
$f = clone $e;
$e->add($interval1);
$e->add($interval2);
echo "Total interval : ", $f->diff($e)->format("%H:%I"), "\n";

完整的Exmaple /(演示):

$a = new DateTime('14:25');
$b = new DateTime('17:30');
$interval1 = $a->diff($b);
echo "interval 1: ", $interval1->format("%H:%I"), "\n";

$c = new DateTime('08:00');
$d = new DateTime('13:00');
$interval2 = $c->diff($d);
echo "interval 2: ", $interval2->format("%H:%I"), "\n";

$e = new DateTime('00:00');
$f = clone $e;
$e->add($interval1);
$e->add($interval2);
echo "Total interval : ", $f->diff($e)->format("%H:%I"), "\n";

您可能还想考虑如何DateInterval存储其值,然后从中扩展以进行自己的计算.下面的例子(演示)是粗糙的,它没有考虑到倒啄,它并没有(重新)设置$days来false和我没有检查/测试的ISO规范在创建期间符,但我认为这是不够表明这个想法:

class MyDateInterval extends DateInterval
{
    /**
     * @return MyDateInterval
     */
    public static function fromDateInterval(DateInterval $from)
    {
        return new MyDateInterval($from->format('P%yY%dDT%hH%iM%sS'));
    }

    public function add(DateInterval $interval)
    {
        foreach (str_split('ymdhis') as $prop)
        {
            $this->$prop += $interval->$prop;
        }
    }
}

$a = new DateTime('14:25');
$b = new DateTime('17:30');
$interval1 = $a->diff($b);
echo "interval 1: ", $interval1->format("%H:%I"), "\n";

$c = new DateTime('08:00');
$d = new DateTime('13:00');
$interval2 = $c->diff($d);
echo "interval 2: ", $interval2->format("%H:%I"), "\n";

$e = MyDateInterval::fromDateInterval($interval1);
$e->add($interval2);
echo "Total interval: ", $e->format("%H:%I"), "\n";

^*如果您编写PHP扩展,它实际上是可能的(至少是排序).

Answer 2

此功能允许您组合任意数量的DateIntervals

/**
 * Combine a number of DateIntervals into 1 
 * @param DateInterval $...
 * @return DateInterval
 */
function addDateIntervals()
{
    $reference = new DateTimeImmutable;
    $endTime = clone $reference;

    foreach (func_get_args() as $dateInterval) {
        $endTime = $endTime->add($dateInterval);
    }

    return $reference->diff($endTime);
}