How to add headers while converting JSON to CSV in PHP?

I have generated nested json from API call. Now I am flattened that json to csv but header is missing. I want header also in csv but not all header with data. Could you please help me to solve this problem. I have given the code and example below-

Example-

JSON-

Array
(
    [id] => 1077079
    [doc_roles__sysr] => Array
        (
            [responseDetails] => Array
                (
                    [pagesize] => 250
                    [pageoffset] => 0
                    [size] => 3
                    [total] => 3
                )

            [data] => Array
                (
                    [0] => Array
                        (
                            [role_name__sys] => approved_email_content_admin__c
                            [user__sys] =>
                            [group__sys] => 1461227826614
                            [document_id] => 1077079
                        )

                    [1] => Array
                        (
                            [role_name__sys] => owner__c
                            [user__sys] => 5486129
                            [group__sys] =>
                            [document_id] => 1077079
                        )

                    [2] => Array
                        (
                            [role_name__sys] => global_integration_user__c
                            [user__sys] =>
                            [group__sys] => 1461227835650
                            [document_id] => 1077079
                        )

                )

        )

)

It is generating a csv file like this-

1000038,250,0,26,26,approved_content_viewer_read_only_acce__c,,1461227890702,1000038
1000069,250,0,20,20,emea_skm_reviewer__c,,1461227853396,1000069
1000114,250,0,3,3,global_integration_user__c,,1461227835718,1000114
1000118,250,0,3,3,global_integration_user__c,,1461227835718,1000118
1000392,250,0,18,18,consumer__c,,1461227890914,1000392

In Output I want CSV File like this-

id,role_name__sys,user__sys,group__sys,document_id
1077079,approved_email_content_admin__c,,1461227826614,1077079
1077079,owner__c,5486129,,1077079
1077079,global_integration_user__c,,1461227835650,1077079

The code which I am using -

function array_flatten ($nonFlat) {
    $flat = array();
    foreach (new RecursiveIteratorIterator(
            new RecursiveArrayIterator($nonFlat)) as $k=>$v) {
        $flat[$k] = $v;
    }
    return $flat;
}

$content = sendCurlRequest($p);
//echo $content;                
$content = json_decode(json_encode($content), true);
$fp = fopen('doc_roles__sys.csv', 'w');
                                                        
foreach ($content['data'] as $fields) {
    print_r($fields);
    fputcsv($fp, array_flatten($fields));
}
fclose($fp);

var_export($content)

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Solution:

You don't really need RecursiveIteratorIterator or any of those jazz as it will make your solution look more complicated. Just add the headers as the first row and get & put the rows in the CSV by accessing the subarrays inside data key.

Snippet:

<?php

$json = <<<JSON
[
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