Wilber Code Challenge

<?php
//Sorting array by age
function ageSort($a, $b)
{
    return ($a->age >= $b->age) ? -1 : 1;
}

$data = '{"data":[{"first_name":"jake","last_name":"bennett","age":31,"email":"jake@bennett.com","secret":"VXNlIHRoaXMgc2VjcmV0IHBocmFzZSBzb21ld2hlcmUgaW4geW91ciBjb2RlJ3MgY29tbWVudHM="},{"first_name":"jordon","last_name":"brill","age":85,"email": "jordon@brill.com","secret":"YWxidXF1ZXJxdWUuIHNub3JrZWwu"}]}';

//Format data to array
$formattedData = json_decode($data)->data;
//Sort array by age
usort($formattedData, 'ageSort');
$emails = [];
foreach ($formattedData as $key => $value) {
    //Create name column
    $formattedData[$key]->name = $value->first_name . ' ' . $value->last_name;

    //Push email to array
    $emails[] = $value->email;
}

//Implode emails by comma
$emails = implode(',', $emails);

print_r($formattedData);
echo '<br/>';
print_r($emails);