Сергей Соколов

// $api_json = ''; //  тут текст из ответа API
$data = json_decode($api_json, true);
$all_streets = [];

foreach ($data as $city) {
    $city_name = $city['name'];
    $city_id = $city['id'];
    $city_streets = $city['streets'];
    foreach ($city_streets as $street) {
        $all_streets[] = [
            'id' => $street['id'],
            'name' => $street['name'],
            // может, и параметры города сюда же?
            'city' => $city_name,
            'city_id' => $city_id,
        ];
    }
}

$ips = array();
for ($ia = 0, $max_ip = 10; $ia <= $max_ip; $ia++) {
    $main_block = $document->find('tr.anon')[$ia];
    array_push($ips, $main_block->first('td')->text());
}

echo implode(', ', $ips);

$date = new DateTime('2021-01-31', new DateTimeZone('UTC'));
$format = 'c'; // ISO 8601
echo $date->format($format);   // 2021-01-31T00:00:00+00:00

$date = new DateTime('2021-01-31', new DateTimeZone('UTC'));
$format = 'Y-m-d\TH:i:s.000';
echo $date->format($format) . 'Z';  // 2021-01-31T00:00:00.000Z

$arr_to_display = array_slice($arr, 0, 10);
foreach ($arr_to_display AS $el) { 
    // ...
}

<?php
$result = [];
while ($ar_fields = $my_elements->GetNext()) {
      $result[] = $ar_fields;
};
?>

const items = <?php echo json_encode($result); ?>;

SELECT code, dt_end
FROM tbl_codes
WHERE code = :code
    AND NOW() >= dt_start
    AND NOW() <= dt_end;