{
"swimmers": [
  "Province": "Ontario",
  "Exemption": "S9,SB9,SM9",
  "Code": "A,3,4",
  "Level": "Level 8",
  "ClassificationDate": "2020",
  "RYEar": "2024",
  "Status": "Registered",
  "ID": "123456",
  "FirstName": "John",
  "LastName": "Doe",
  "Gender": "M",
  "AGE": null,
  "DOB": "01/11/2000",
  "Clubs": [
      "Clubname": "Human Fish",
      "Code": "ABC",
      "Clubid": "300"
  "Email": null,
  "Language": "E",
  "ChallengeData": null
 //more entries with same pattern as first
  "status": "OK",
  "application": "SOme App API"
}

$csvFileName = 'converted.csv';
$json = 'myjson.json'; 
$data = file_get_contents($json); 
$payload= json_decode($data); 
$file_pointer = fopen($csvFileName, 'w');
if ($file_pointer){
    foreach($payload['swimmers'] as $row) {
        // $clubs = $row['Clubs'] ;
        // if (is_array($clubs)){
            // foreach($clubs as $c){
                // fputcsv($file_pointer, $c);
        // }else{
            fputcsv($file_pointer, $row);
}