How to group this PHP array by date and sum the values [closed]

Answer 1

You have:

• an array with $adults, where each $adult is object with thedate and theadults properties.

Now you want to make $groupedAdults, which will be array using thedate property as key. So the logic could look like this:

1. foreach ($adults as $adult):
2. $date = $adult->thedate
3. check if array_key_exists($date, $groupedAdults)
4. if no, copy current $adult to $groupedAdults[$date]
5. if yes, add $adult->theadults to the $groupedAdults[$date]->adults

Give it a try, hopefully you will be able to write it on your own now.