PHP array reformat to highchart json ob - php

Question

I am try to format an array to a JSON object that highcharts supports. My array from the database is as follows:
Array
(
[0] => Array
(
[Group_ID] => 1
[Name] => A line graph
[month] => 4
[amount] => 7700
)
[1] => Array
(
[Group_ID] => 2
[Name] => B Line graph
[month] => 4
[amount] => 390
)
[2] => Array
(
[Group_ID] => 1
[Name] => A line graph
[month] => 5
[amount] => 5000
)
[3] => Array
(
[Group_ID] => 2
[Name] => B line graph
[month] => 5
[amount] => 210
)
)
I need to create an array like this to be able to create a highchart compatible JSON object:
Array
(
[0] => Array
(
[name] => A revenue
[data] => Array
(
[4] => 7700 //amount for the fourth month
[5] => 5000 //amount for the fifth month
)
)
[1] => Array
(
[name] => B revenue
[data] => Array
(
[4] => 390 //amount for the fourth month
[5] => 210 //amount for the fifth month
)
)
)
I have managed to come up with this array using my foreach but I cant seem to find a way to do it correctly:
Array
(
[0] => Array
(
[name] => A line graph
[amount] => 7700
[month] => 4
)
[1] => Array
(
[name] => B line graph
[amount] => 390
[month] => 4
)
[2] => Array
(
[name] => A line graph
[amount] => 5000
[month] => 5
)
[3] => Array
(
[name] => B line graph
[amount] => 210
[month] => 5
)
)
My foreach:
foreach ($data as $key => $value) {
$r[] = [
'name' => $value['Line_GraphName'],
'data' => $value['amount'],
'month' => $value['month']
];
}

Answer 1

You can create it very simply like this:
foreach ($data as $value) {
$r[$value['Group_ID']]['name'] = $value['Line_GraphName'];
$r[$value['Group_ID']]['data'][$value['month']] = $value['amount'];
}
Loop and create a result with Group_ID as the key and add the name key and value
Add data array and append month as key and amount as value
If you don't like having Group_ID as the key and want to re-index:
$r = array_values($r);

Answer 2

The solution using array_walk and array_values functions:
$result = [];
array_walk($data, function($v) use(&$result) {
$key = $v['Group_ID'] . $v['Name'][0]; // compound key: "group_id + revenue's prefix"
if (!isset($result[$key])) {
$result[$key] = ['name' => $key[1] . " Revenue", 'data' => [$v['month'] => $v['amount']]];
} else {
$result[$key]['data'][$v['month']] = $v['amount'];
}
});
print_r(array_values($result));
The output:
Array
(
[0] => Array
(
[name] => A Revenue
[data] => Array
(
[4] => 7700
[5] => 5000
)
)
[1] => Array
(
[name] => B Revenue
[data] => Array
(
[4] => 390
[5] => 210
)
)
)