Refactor the JSON object in Laravel - php

Question

Here's my JSON:
[
{
"ID": 1,
"SOURCEID": 1,
"TIMESTAMP": "2020-04-05 07:05:29",
"VALUE": "30"
},
{
"ID": 4,
"SOURCEID": 2,
"TIMESTAMP": "2020-04-05 07:05:17",
"VALUE": "40"
},
{
"ID": 3,
"SOURCEID": 1,
"TIMESTAMP": "2020-04-06 12:04:59",
"VALUE": "35"
},
{
"ID": 5,
"SOURCEID": 1,
"TIMESTAMP": "2020-06-17 12:01:32",
"VALUE": "1"
},
{
"ID": 6,
"SOURCEID": 2,
"TIMESTAMP": "2021-06-17 13:55:29",
"VALUE": "2"
}
]
I need to refactor the JSON like
I need JSON to be refactor based on timestamp and source id and JSON is dynamic like a number of source id present in the given JSON there are two ids that is 1 and 2. Below I gave the expected output.
I need a Unique time stamp in a separate array-like
[2020-04-05,2020-04-06,2020-06-17,2021-06-17]
{ "sourceid: 1, "data":[30,35,1,0], }, { "sourceid": 2, "data":[40,0,0,2], }
Note: The value fills according to the date. Other it should fill as 0.
I have tried like this :
`$data=json_decode($result);
$timestamp=[];
$dataList=[];
foreach ($data as $value){
$date=\Carbon\Carbon::parse($value->TIMESTAMP)->toDateString();
if(!in_array($date, $timestamp, true)){
array_push($timestamp, $date);
}
if(isset($dataList[$value->SOURCEID])){
array_push($dataList[$value->SOURCEID]['data'],$value->VALUE);
} else{
$dataList[$value->SOURCEID]=[
'SOURCEID'=>$value->SOURCEID,
'data'=>[$value->VALUE]
];
}
}
dump($timestamp);
dump($dataList);`
But it produce like
{ "sourceid: 1, "data":[30,35,1], }, { "sourceid": 2, "data":[40,2]}
but I need like
{ "sourceid: 1, "data":[30,35,1,0], }, { "sourceid": 2, "data":[40,0,0,2] }

Answer 1

You need to find the unique timestamps and source ids and then use that to develop your new array. Since you are using laravel, using a collection makes it easier.
I used the transform modifier to modify the TIMESTAMP field so we can "query" it easier via ->where
Please note, I am using the 2nd param true modifier for the json_decode function to get an associative array rather than an object.
$data = json_decode($result, true); // note true
$collection = collect($data);
// transform the timestamp column
$collection->transform(function ($item) {
$item['TIMESTAMP'] = \Carbon\Carbon::parse($item['TIMESTAMP'])->toDateString();
return $item;
});
// get all unique timestamps and source ids
$timestamps = $collection->pluck('TIMESTAMP')->unique();
$sourceIds = $collection->pluck('SOURCEID')->unique();
$dataList = [];
foreach ($sourceIds as $sourceId) {
$items = $collection->where('SOURCEID', $sourceId);
$dataList[$sourceId]['sourceid'] = $sourceId;
foreach ($timestamps as $timestamp) {
$occurrence = $items->where('TIMESTAMP', $timestamp)->first();
if ($occurrence) {
$dataList[$sourceId]['data'][] = $occurrence['VALUE'];
} else {
$dataList[$sourceId]['data'][] = 0;
}
}
}
dd($dataList);
Note you might want to cast $occurrence['VALUE']; to int via (int) $occurrence['VALUE'];
For more information on collections click here.
Output: