public static function resolveAsyncQueries(array $conns, array $asyncs)
 {
     assert_instances_of($conns, __CLASS__);
     assert_instances_of($asyncs, 'mysqli');
     $read = $error = $reject = array();
     foreach ($asyncs as $async) {
         $read[] = $error[] = $reject[] = $async;
     }
     if (!mysqli::poll($read, $error, $reject, 0)) {
         return array();
     }
     $results = array();
     foreach ($read as $async) {
         $key = array_search($async, $asyncs, $strict = true);
         $conn = $conns[$key];
         $conn->endAsyncConnection($async);
         $results[$key] = $conn->processResult($async->reap_async_query());
     }
     return $results;
 }