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 can simply use nested foreach with is_array()

$myArray = array(
    '2014-4-3' => 2,
    '2014-4-4' => 3,
    '2014-4-5' => array(
        0 => 3,
        1 => 7,
        2 => 7,
        3 => 7
    )
);
$new=array();
foreach($myArray as $day=>$value){
    $newval =0;
    if(is_array($value)){
        foreach ($value as $val) {
            $newval += $val;
        }
    }else{
        $newval = $value;
    }
    $new[$day]=$newval;
}

var_dump($new);

Answer 2

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

Answer 3

You can try this one:

foreach($myArray as &$value){
    if(is_array($value)){
         $value = array_sum($value);
    }
}