$search_results = file_get_contents("https://www.googleapis.com/youtube/v3/search?part=snippet&q=$keywords&type=video&key=" . $apikeys[0] ."&maxResults=21");
$search_results = file_get_contents("https://www.googleapis.com/youtube/v3/search?part=snippet&q=$keywords&type=video&key=". $apikeys[1] ."&maxResults=21");

foreach ($apikeys as $apikey) {
$search_results = file_get_contents("https://www.googleapis.com/youtube/v3/search?part=snippet&q=$keywords&type=video&key=$apikey&maxResults=21");
}