sum and merge duplicate value from a multi-dimensional array

Question

I would like to sum the value of movements while keeping an unique value for day on the same array.

The base array:

array (607)
0 => array (2)
    day => "11" (2)
    movements => 1
1 => array (2)
    day => "11" (2)
    movements => 1
2 => array (2)
    day => "11" (2)
    movements => 1
3 => array (2)
    day => "12" (2)
    movements => 1
4 => array (2)
    day => "12" (2)
    movements => 1
5 => array (2)
    day => "12" (2)
    movements => 1

[...]

The result I am expecting (for each day sum movements):

array (607)
    0 => array (2)
        day => "11" (2)
        movements => 3
    1 => array (2)
        day => "12" (2)
        movements => 3    
    [...]

Any help would be greatly appreciated.

Edit: What I have tried so far :

sum-array-values-of-the-same-key: it also sum daywhich is not what I am expecting.

my own code:

$arr1 = $stats['data']['vhc']; // contain ['day'] and ['movements']
$arr2 = $data['vhc']; // contain ['day'] and ['movements']
$sum = [];

if (!empty($arr1)) {
    $result = [];
    foreach ($arr1 as $key => $value) {
        if (isset($arr2[$key]['day']) && $arr2[$key]['day'] == $value['day']) {
            $result['day'] = $value['day'];
            $result['movements'] = $value['movements'] + $arr2[$key]['movements'];
        }
        array_push($sum, $result);
    }
}

Alive to die - Anant · Accepted Answer · 2018-02-16T07:52:48.990

1

You can easily do with foreach() and array_values()

$final_array = [];

foreach($array as $arr){
  $final_array[$arr['day']]['day'] = $arr['day'];
  $final_array[$arr['day']]['movements'] = (isset($final_array[$arr['day']]['movements']))? $final_array[$arr['day']]['movements']+$arr['movements'] : $arr['movements'];    
}
$final_array = array_values($final_array);

print_r($final_array);

Output:-https://eval.in/957326

edited Feb 16 '18 at 07:52

answered Jan 02 '18 at 09:32

Alive to die - Anant

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score 1 · Answer 2 · answered Feb 16 '18 at 17:47

This method will not bother overwriting result array data with the same value.

Code: (Demo)

$array=[
    ['day'=>'11','movements'=>'1'],
    ['day'=>'11','movements'=>'1'],
    ['day'=>'11','movements'=>'1'],
    ['day'=>'12','movements'=>'1'],
    ['day'=>'12','movements'=>'1'],
    ['day'=>'12','movements'=>'1']
];
foreach($array as $row){  // iterate all rows
    if(!isset($result[$row['day']])){  // if first occurrence of day...
        $result[$row['day']]=$row;     // save the full row with day as the temporary key
    }else{                                    // if not the first occurrence of day...
        $result[$row['day']]['movements']+=$row['movements'];  // add movements value
    }
}
var_export(array_values($result));

Output:

array (
  0 => 
  array (
    'day' => '11',
    'movements' => 3,
  ),
  1 => 
  array (
    'day' => '12',
    'movements' => 3,
  ),
)

sum and merge duplicate value from a multi-dimensional array

2 Answers2