private static function makePromisesFromQueue(array $imgQueue, Client $client, array &$imgSizes, array &$errors)
{
/** @var Promise[] $promises */
$promises = [];
foreach ($imgQueue as $imageSrc) {
$promise = $client->headAsync($imageSrc)->then(function (ResponseInterface $res) use(&$imgSizes, &$errors, $imageSrc) {
if ($headers = $res->getHeaders() and array_key_exists('Content-Length', $headers) and is_array($headers['Content-Length']) and count($headers['Content-Length']) > 0) {
array_push($imgSizes, intval($headers['Content-Length'][0]));
} else {
array_push($errors, 'unable to get image size: ' . $imageSrc);
}
}, function (RequestException $e) use($imageSrc, &$errors) {
array_push($errors, 'unable to get image headers: ' . $imageSrc);
});
array_push($promises, $promise);
}
return $promises;
}
