How can external data sources be effectively integrated with the State Pattern in PHP to manage different states?

When integrating external data sources with the State Pattern in PHP to manage different states, you can create separate classes for each state that handle the logic for that specific state. These classes can interact with the external data sources to retrieve or update relevant information based on the current state. By encapsulating state-specific behavior in separate classes, you can easily switch between states and maintain a clear separation of concerns. 

<?php

interface State {
    public function handleState();
}

class StateA implements State {
    public function handleState() {
        // Logic for State A
        // Access external data sources here
    }
}

class StateB implements State {
    public function handleState() {
        // Logic for State B
        // Access external data sources here
    }
}

class Context {
    private $state;

    public function setState(State $state) {
        $this->state = $state;
    }

    public function request() {
        $this->state->handleState();
    }
}

// Example usage
$context = new Context();

$stateA = new StateA();
$context->setState($stateA);
$context->request();

$stateB = new StateB();
$context->setState($stateB);
$context->request();

?>

Keywords

State Pattern PHP External Data Sources Integration States

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