How to Sum Date Intervals in PHP?

Adding Date Intervals in PHP

In PHP, we may encounter situations where we need to add two or more date intervals to calculate the total duration in hours and minutes. To achieve this sum, we can follow these steps:

1. Create DateTime objects for each time interval.
2. Use the diff() method to calculate the difference between each pair of objects.

<code class="php">$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 />";</code>

3. To obtain the total duration, we need to create a new DateTime object as a reference point.

<code class="php">$e = new DateTime('00:00');</code>

4. Clone the reference object to preserve its original time.

<code class="php">$f = clone $e;</code>

5. Add the first interval to the reference object using the add() method.

<code class="php">$e->add($interval1);</code>

6. Repeat step 5 with the second interval.

<code class="php">$e->add($interval2);</code>

7. Finally, calculate the difference between the original reference object and the modified reference object to obtain the total interval.

<code class="php">echo "Total interval: " . $f->diff($e)->format("%H:%I");</code>

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