$url_content = "https://www.googleapis.com/youtube/v3/videos?id=$video_ID&key=$api_key&part=statistics";
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url_content);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 5);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
$contents = curl_exec($ch);

$contents = file_get_contents("https://www.googleapis.com/youtube/v3/videos?id={$video_id}&key={$api_key}&part=snippet,statistics");

$option = array(
    'id' => $video_id,
    'key' => $api_key,
    'part' => 'statistics'
);
$url = "https://www.googleapis.com/youtube/v3/videos?".http_build_query($option, 'a', '&');


$curl_handle=curl_init();
curl_setopt($curl_handle, CURLOPT_URL,$url);
curl_setopt($curl_handle, CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl_handle, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.13) Gecko/20080311 Firefox/2.0.0.13');
$json_response = curl_exec($curl_handle);
curl_close($curl_handle);

Array
(
    [0] => https://www.googleapis.com/youtube/v3/videos?id=VID&key=KEY&part=statistics
    [1] => stdClass Object
        (
            [error] => stdClass Object
                (
                    [errors] => Array
                        (
                            [0] => stdClass Object
                                (
                                    [domain] => usageLimits
                                    [reason] => ipRefererBlocked
                                    [message] => There is a per-IP or per-Referer restriction configured on your API key and the request does not match these restrictions. Please use the Google Developers Console to update your API key configuration if request from this IP or referer should be allowed.
                                    [extendedHelp] => https://console.developers.google.com
                                )

                        )

                    [code] => 403
                    [message] => There is a per-IP or per-Referer restriction configured on your API key and the request does not match these restrictions. Please use the Google Developers Console to update your API key configuration if request from this IP or referer should be allowed.
                )

        )

)