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public php v1 · immutableclass TrackingApplication { var $clientUnit; function TrackingApplication() { $this->clientUnit = new MobileUnit(); } function ... { $this->clientUnit->SetValue(); } ...}class MobileUnit {}class TrackingApplication { var $clientUnit; function TrackingApplication() { $this->clientUnit = new MobileUnit(); } function ... { $this->clientUnit->SetValue(); } ...}class MobileUnit {}