use \Ceic\Api\Configuration;
use \Ceic\Api\Apis\SeriesApi;
use \Ceic\Api\Models\QueryEntities\SeriesApiQueryEntity;

$access_token = "ENTER YOUR API KEY HERE";
$config = Configuration::getDefaultConfiguration();
Configuration::setDefaultConfiguration($config);
$seriesApi = new SeriesApi();
$seriesQueryEntity = new SeriesApiQueryEntity();

$example_series_id = array(EXAMPLE SERIES ID);

# Separate the list of series in smaller chunks (25 series)
$example_series_id_chunks = array_chunk ($example_series_id,25);
# Get the series per every chunk
foreach ($example_series_id_chunks as $chunk) {
    $series_ids = implode(" ",$chunk);
    $seriesQueryEntity->setId($series_ids)->setToken($access_token);
    $series = $seriesApi->searchSeriesQuery($seriesQueryEntity);
    var_export($series);
    $series_ids = "";
}

?>