Search for duplicates, if found sum values

问题

I have this array :

$data = [
    0 => [
       'date'       => '2018-09-12',
       'department' => 12,
       'country'    => 14,
       'total'      => 12
    ],
    1 => [
       'date'       => '2018-09-12',
       'department' => 12,
       'country'    => 14,
       'total'      => 18
    ],
    2 => [
       'date'       => '2018-09-12',
       'department' => 12,
       'country'    => 15,
       'total'      => 10
    ]
];

The return should be :

$return = [
   0 => [
       'date'       => '2018-09-12',
       'department' => 12,
       'country'    => 14,
       'total'      => 30
   ],
   1 => [
       'date'       => '2018-09-12',
       'department' => 12,
       'country'    => 15,
       'total'      => 10
   ]
];

I tried like this :

foreach ($data as $value) {
     if(!in_array($value, $data)) {
         $result[] = $data;
     }
}

The idea is, if all fields except total are indentical, then add total to the existing total with the same fields. Please help me. Thx in advance and sorry for my english

回答1:

You can do this by looping through your array, comparing all the other values of each element (date, department and country) with previously seen values and summing the totals when you get a match. This code uses serialize to generate a composite key of the other values for comparison:

$output = array();
$keys = array();
foreach ($data as $value) {
    $total = $value['total'];
    unset($value['total']);
    $key = serialize($value);
    if (($k = array_search($key, $keys)) !== false) {
        $output[$k]['total'] += $total;
    }
    else {
        $keys[] = $key;
        $output[] = array_merge($value, array('total' => $total));
    }
}
print_r($output);

Output:

Array (
    [0] => Array (
        [date] => 2018-09-12
        [department] => 12
        [country] => 14
        [total] => 30 
    )
    [1] => Array (
        [date] => 2018-09-12
        [department] => 12
        [country] => 15
        [total] => 10
     ) 
)

Demo on 3v4l.org

By using the composite key as the index into the $output array, we can simplify this code, we just need to use array_values after the loop to re-index the $output array:

$output = array();
foreach ($data as $value) {
    $v = $value;
    unset($v['total']);
    $key = serialize($v);
    if (isset($output[$key])) {
        $output[$key]['total'] += $value['total'];
    }
    else {
        $output[$key] = $value;
    }
}
$output = array_values($output);
print_r($output);

Output is the same as before. Demo on 3v4l.org

回答2:

You can also try this method as it doesn't involve much memory intensive operations such as merging, especially while working with large amount of data:

$new_data=[];
foreach($data as $key=>$value){
    $i=array_search($value["date"],array_column($new_data,"date"));
    if(($i!==false)&&($new_data[$i]["department"]==$value["department"])&&($new_data[$i]["country"]==$value["country"])){
        $new_data[$i]["total"]+=$value["total"];
    }
    else{
        $new_data[]=$value;
    }
}
print_r($new_data);

来源：https://stackoverflow.com/questions/55280844/search-for-duplicates-if-found-sum-values

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