1/ Return type of Plivo\Resources\ResourceList::getIterator() should either be
compatible with IteratorAggregate::getIterator(): Traversable
2/ Exception Message in PHP8.1:
http_build_query(): Passing null to parameter 2 ($numeric_prefix) of type string is deprecated
We have found some error when using on PHP 8.1
1/ Return type of Plivo\Resources\ResourceList::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable 2/ Exception Message in PHP8.1: http_build_query(): Passing null to parameter 2 ($numeric_prefix) of type string is deprecated