Give name to array in Json/PHP - php

Question

In AJAX I retrieve in database the last date of a document by category (for example the category invoice, orders, etc.) thanks to this request:
  // In each category there can be several documents
$stmt = $bdd->prepare('SELECT file_name, max(file_creation) as file_creation, file_category
FROM all_files
WHERE ...
GROUP BY file_category');
$stmt ->execute(array(
...
));
$arr = $stmt->fetchAll();
echo json_encode($arr);
So I get it back in JSON:
[
   {
      "File_name": "order_18"
      "0": "order_18"
      "File_creation": "2018-11-28"
      "1": "2018-11-28"
      "File_category": invoice "
      "3": invoice "
   }
   {
      "File_name": "order_18"
      "0": "order_18"
      "File_creation": "2018-11-25"
      "1": "2018-11-25"
      "File_category": "order"
      "3": "order"
   }
]
I then want to place each data in the right places with jquery, like this:
$ ('#label-order').text('') // the text will have to be: 2018-11-25
$ ('#label-invoice').text('') // the text will have to be: 2018-11-28
The problem is that I do not know how to recover the data that interests me to put it in the right places because the number of categories will increase over time
So I thought of doing something like that, to get the data back to data ["invoice"] ["file_creation"] and data ["order"] ["file_creation"]:
[
   "invoice": {
      "File_name": "order_18"
      "0": "order_18"
      "File_creation": "2018-11-28"
      "1": "2018-11-28"
      "File_category": invoice "
      "3": invoice "
   }
   "order": {
      "File_name": "order_18"
      "0": "order_18"
      "File_creation": "2018-11-25"
      "1": "2018-11-25"
      "File_category": "order"
      "3": "order"
   }
]
Is that possible? If so, how can I do?
Is there a better solution?

Answer 1

Here is a code to have in a result list of invoices and orders separately.
After receiving data on front-end you can use simple code to group all items:
var data = [
{
"File_name": "order_18",
"0": "order_18",
"File_creation": "2018-11-28",
"1": "2018-11-28",
"File_category": "invoice",
"3": "invoice "
},
{
"File_name": "order_18",
"0": "order_18",
"File_creation": "2018-11-25",
"1": "2018-11-25",
"File_category": "order",
"3": "order"
}
]
var categories = {
invoices: [],
orders: []
}
data.map((item) => {
if(item['File_category'] === 'order') {
categories.orders.push(item)
} else if(item['File_category'] === 'invoice') {
categories.invoices.push(item)
}
})
console.log(categories)
Than you can just loop over specific categories like categories.invoices or categories.orders and easily append it to body.

Answer 2

Doing this using the PHP code:
<?php
//$arrays = $stmt->fetchAll();
$arrays=
[
[
"File_name"=>"order_18",
"File_creation"=>"2018-11-28",
"File_category"=>"invoice",
],
[
"File_name"=>"order_18",
"File_creation"=>"2018-11-25",
"File_category"=>"order",
]
];
foreach($arrays as $index=>$array)
{
if(isset($array["File_category"]))
{
$key=$array["File_category"];
unset($array["File_category"]);
$arrays[$key][] = $array;
unset($arrays[$index]);
}
}
print_r($arrays);
//echo json_encode($arrays);
?>
The result will be:
Array
(
[invoice] => Array
(
[0] => Array
(
[File_name] => order_18
[File_creation] => 2018-11-28
)
)
[order] => Array
(
[0] => Array
(
[File_name] => order_18
[File_creation] => 2018-11-25
)
)
)