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

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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CodePudding user response：

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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