Renaming JSON subkeys using PHP

Question

I'm trying to help a JSON structure format from an existing project, and the goal is to rename some subkeys not the value. The JSON format like this

{
  "table-name": "Kiwi",
  "created-on": "November 20, 2021",
  "token": "lsUVozOB2TxhvMv",
  "icons": "default",
  "links": "default",
  "extra": "default",
  "mode": "Private",
  "collaborators": [],
  "columns": {
    "Name": {
      "type": "text",
      "extra": ""
    },
    "Info": {
      "type": "longtext",
      "extra": ""
    },
    "Status": {
      "type": "droplist",
      "extra": {
        "fr": "Pending",
        "sc": "On-going",
        "th": "Completed",
        "fo": "Cancelled"
      }
    }
  },
  "data": [{
      "Name": "Team Reports",
      "Info": "Submitting marketing materials reports",
      "Status": "Completed"
    },
    {
      "Name": "Fabia HR",
      "Info": "Brian asking for a report",
      "Status": "Pending"
    },
    {
      "Name": "Fabia",
      "Info": "Meeting with CEO @cafe 9:00",
      "Status": "Cancelled"
    }
  ]
}

And we're looking into the columns to rename the Name into Task and still keep the other. After using array push and slice the keys, I'm getting 0 as the keys and "Task as subkeys like

"0":{
  "Task":{
    "type":"text",
    "extra":""
  },

The code looks like this. Please do share your solutions in your spare time, thank you in advance, really appreciate any attention. Total noob here 🖐 PHP:

$file = file.json;  
$jsn = file_get_contents($file);
$data = json_decode($jsn, true);
 
//get name data array 
$sub_data = $data['columns']['Name'];

$new_rename = array(
    "Task" => $sub_data;
);

array_push($data['columns'],$new_rename);

//now delete old "Name";
array_slice($data['columns'],'Name')

//save stuff
$jsn = json_encode($data);
file_put_contents($file,$jsn);

Answer 1

Given you're working with JSON objects and thus PHP associative arrays (as opposed to numerically indexed), all you really need to do is set the new property and unset the old one

$data["columns"]["Task"] = $data["columns"]["Name"];
unset($data["columns"]["Name"]);

Demo ~ https://3v4l.org/7pBpZ