izzum\statemachine\StateMachine::doCheckCanTransition PHP Method

    private function doCheckCanTransition(Transition $transition)
    {
        try {
            // check if we have this transition on the current state.
            if (!$this->getCurrentState()->hasTransition($transition->getName())) {
                return false;
            }
            // possible hook so your application can place an extra guard on the
            // transition. possible entry~ or exit state type of checks can also
            // take place in this hook.
            if (!$this->_onCheckCanTransition($transition)) {
                return false;
            }
            // an event handler that is possibly defined on the domain model: onCheckCanTransition
            if (!$this->callEventHandler($this->getContext()->getEntity(), 'onCheckCanTransition', $this->getContext()->getIdentifier(), $transition)) {
                return false;
            }
            // this will check the guards defined for the transition: Rule and callable
            if (!$transition->can($this->getContext())) {
                return false;
            }
        } catch (Exception $e) {
            $this->handlePossibleNonStatemachineException($e, Exception::SM_CAN_FAILED);
        }
        // if we come here, this acts as a green light to start the transition.
        return true;
    }