The asset system is currently in testnet. These methods require a testnet node instance to use.
Check the asset balances for an address
// Returns an array of asset balances $arionum->getAssetBalance($address);
Retrieve a list of registered assets
// Returns an array of assets $arionum->getAssets();
Retrieve an asset by its id
// Returns an array of assets $arionum->getAsset($assetId);