$dataIn = 'Laldldlldlsdls.... Ends Jul 2, 2021';
$dataOut = preg_replace_callback(
    '/Ends (.+)/',
    fn($matches) => date('F d, Y', strtotime($matches[1])),
    $dataIn
);

$json = '{
    "result": {
        "Random ItemName": [
            {
                "user": "user1",
                "time_upd": "2020-12-09 12:25:03"
            }, {
                "user": "user2",
                "time_upd": "2020-12-09 12:25:03"
            }, {
                "user": "user3",
                "time_upd": "2020-12-09 12:25:03"
            }
        ]
    }
}';
$data = json_decode($json, true);
$i = 0; // меняется в цикле
$user_name = $data['result']['Random ItemName'][$i]['user'];
$time_upd = $data['result']['Random ItemName'][$i]['time_upd'];

$user_name = $data['result'][array_key_first($data['result'])][$i]['user'];
$time_upd = $data['result'][array_key_first($data['result'])][$i]['time_upd'];

foreach ($data['result'] as $arrayKey => $arrayValue) {
    foreach ($arrayValue as $arraySubvalue) {
        $user_name = $arraySubvalue['user'];
        $time_upd = $arraySubvalue['time_upd'];
        // …
    }
}

if ($fh = fopen('/public/vag102020.csv', 'r')) {
    while (($csvStr = fgetcsv($fh, 1024, ';')) !== false) {
        $csvArr[] = $csvStr;
    }
}