Dota 2 Workshop Tools/Scripting/API/CDOTA BaseNPC.GetPlayerOwnerID
Get the owner player ID for this unit.
It is recommended that instead of this function you use GetOwner():GetPlayerID(). Units summoned in LUA will return -1 for :GetPlayerOwnerID(), but with GetOwner():GetPlayerID() it will correctly return the owners player ID
int - The owning players ID (0-9) If none is found than it will return -1