createTeam(string $teamname)//create new Team! True will be returned if the team has already been created.
checkTeam(string $teamname)//Make sure that the team exists.Returns true if the team exists, false otherwise.
checkPTeam(Player $player)//Make sure the player belongs to the team. In that case, it returns true, otherwise it returns false.
deleteTeam(string $teamname)//Delete the team but return false if the team does not exist.
joinTeam(string $teamname, Player $player)//Returns false if the player is to join the team but the team does not exist.
leaveTeam(string $teamname, Player $player)//Player leave team.However, if the team does not exist or does not belong to the team, false is returned.
getTeamData(string $teamname)//The number of people belonging to that team is returned, but false is returned if the team does not exist.
getPTeam(Player $player)//Returns the name of the team the player belongs to, but false if the player does not belong to the team.
getAllPlayer()//The team to which all the players belong is returned as an array.
getAllTeam()//All teams and the number of people belonging to them are returned as an array.