nested JSON array to csv in PHP - php

Question

How can I output this json to csv properly?
My json file pattern is like this:
{
"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"
}
I had success to turn it into a csv with the code below but I'm unable to output the clubs field in the csv file, instead of showing the club, it just shows "Array()". I tried to fix that with the commented code but it doesn't solve the problem.
$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);
}
}

Answer 1

Append each element of the Clubs field to $row, then remove the Clubs field.
foreach ($payload['swimmers'] as $row) {
foreach ($row['Clubs'] as $club) {
$row = array_merge($row, array_values($club));
}
unset($row['Clubs']);
fputcsv($file_pointer, $row);
}