Assign the key's name from a PHP array to a variable - php

Question

I'm a bit new to PHP and programming in general so please bear with me if I don't explain with the correct phrasing.
I am parsing an array into specific columns in order to later parse that data into a preexisting excel spreadsheet. Each array has specific keys that equate to specific columns.
The part I need help with is the following:
This is part of the array (it repeats this but with different data, an array for each):
{
{
"Batches": "24",
"Timestamp": " ",
"Manager": " ",
"Region": " ",
"Name": " ",
"Cell": " ",
"Email": " ",
"Personalized or Blank": " ",
"FNO's": " ",
"Order Total": " ",
"R289 FF Air": "0",
"R289 T3": "0",
"R399": "0",
"R429": "0",
"R489": "0",
"R599": "0",
"Openserve R549": "0",
"Openserve R299": "0",
"Vumatel": "0",
"Octotel": "0",
"Octotel T3": "0",
"Balwin": "0",
"Evotel": "1000",
"Netstream": "0",
"Metrofibre": "0",
"Vodacom": "0",
"TT Connect": "0",
"WAN": "0",
"Link Africa": "0",
"Ambassador": "0",
"Link Layer": "0",
"Open Fibre": "0",
"Zoom Fibre": "0"
},
This is the loop:
$i = 0;
foreach($Data2022_23 as $item) {
$A[$i] = $item['Order Total'];
$B[$i] = $item['Timestamp'];
$C[$i] = $item['Manager'];
$D[$i] = $item['Region'];
$E[$i] = $item['Name'];
$F[$i] = $item['Cell'];
$G[$i] = $item['Email'];
$H[$i] = $item['Personalized or Blank'];
foreach($Data2022_23 as $key => $value) {
if($key != "Batches" && $key != "Timestamp" && $key != "Manager" && $key != "Region"
&& $key != "Name" && $key != "Cell" && $key != "Email" && $key != "Personalized or Blank"
&& $key != "FNO's" && $key != "Order Total" && $value != "0"){
$J = array_keys($Data2022_23, $key);
}
}
$i++;
}
From $A to $H works, those are the specific columns, I need help with assigning $J the value of the key which is not 0, ie. "Evotel" as per the array above. I have tried tinkering the nested foreach loop in the code above but I am struggling to get the correct data output.
Any assistance will help.
I've tried different iteration of the nested for each loop, such as:
Assigning $J the $key, which return the index not the string.
$J = $key;
Trying a whole lot of tinkering on the foreach loop but none of it really worked.
I'm trying to get $J to have the value of the key, not the index which I keep getting.
Something like:
echo $J;
With result:
Array([0] => "Evotel")
or something like that.