php - Sum array value per day in multidimensional array

Question

There are a number of great Q&As on Stackoverflow on how to sum across a multidimensional associative array but I have not found a working example of doing subtotals within

Answer 1

You could do this using array_map() and array_sum():

$output = array_map(function($a) { 
    return is_array($a) ? array_sum($a) : $a; 
}, $myArray);

Here's a demo