RtcTokenBuilder.php: Source code for generating a token for the following SDKs:
Agora Native SDK v2.1+
Agora Web SDK v2.4+
Agora Recording SDK v2.1+
Agora RTSA SDK
The Agora RTSA SDK supports joining multiple channels. If you join multiple channels at the same time, then you MUST generate a specific token for each channel you join.