YouTubeCacheProblemSolving.php

<?php

foreach ($configuration->requestList as $request) {
    $video = $request->video;
    $endpoint = $request->endpoint;
    $lowestLatency = $endpoint->dataCenterLatency;
    $selectedCache = null;

    /**
     * @var int $id
     * @var Cache $connectedCache
     */
    foreach ($endpoint->connectedCaches as $id => $connectedCache) {
        $latency = $endpoint->connectedCachesLatency[$id];
        if ($latency < $lowestLatency && $connectedCache->canStore($video)) {
            $lowestLatency = $latency;
            $selectedCache = $connectedCache;
        }
    }

    if ($selectedCache instanceof Cache) {
        $selectedCache->store($video);
    }
}