How to sum array value of duplicate data

Question

I have an array with some of same ID value as shown in below.

[
    {\"ID\":\"126871\",\"total\":\"200.00\",\"currency\":\"USD\",\"name\":\"John         


        

Answer 1

You will need to:

• Convert your json string to a php array with json_decode.
• Loop through the rows and group them using compound temporary keys. In other words generate a single string from each row's ID & currency values and use that string as the temporary unique key.
• Sum the grouped row's total values.
• Then prepare the output array for its return to json by reindexing the rows and calling json_encode().

Code: (Demo)

$json='[
    {"ID":"126871","total":"200.00","currency":"USD","name":"John"},
    {"ID":"126872","total":"2000.00","currency":"Euro","name":"John"},
    {"ID":"126872","total":"1000.00","currency":"Euro","name":"John"},
    {"ID":"126872","total":"500.00","currency":"USD","name":"John"},
    {"ID":"126872","total":"1000.00","currency":"Euro","name":"John"}
]';

$array=json_decode($json,true);  // convert to array
foreach($array as $row){
    if(!isset($result[$row['ID'].$row['currency']])){
        $result[$row['ID'].$row['currency']]=$row;  // on first occurrence, store the full row
    }else{
        $result[$row['ID'].$row['currency']]['total']+=$row['total'];  // after first occurrence, add current total to stored total
    }
}
$result=json_encode(array_values($result));  // reindex the array and convert to json
echo $result;  // display

Output:

[
    {"ID":"126871","total":"200.00","currency":"USD","name":"John"},
    {"ID":"126872","total":4000,"currency":"Euro","name":"John"},
    {"ID":"126872","total":"500.00","currency":"USD","name":"John"}
]