用更通用的方式替换elseif

switch ($variable) {
    case 'value1':
        // 执行代码块1
        break;
    case 'value2':
        // 执行代码块2
        break;
    default:
        // 执行默认代码块
}

interface Strategy {
    public function execute();
}

class StrategyA implements Strategy {
    public function execute() {
        // 执行策略A的代码
    }
}

class StrategyB implements Strategy {
    public function execute() {
        // 执行策略B的代码
    }
}

class Context {
    private $strategy;

    public function setStrategy(Strategy $strategy) {
        $this->strategy = $strongStrategy;
    }

    public function executeStrategy() {
        $this->strategy->execute();
    }
}

// 使用示例
$context = new Context();
$context->setStrategy(new StrategyA());
$context->executeStrategy();

$map = [
    'value1' => function() {
        // 执行代码块1
    },
    'value2' => function() {
        // 执行代码块2
    },
];

$value = 'value1';
if (isset($map[$value])) {
    $map[$value]();
} else {
    // 执行默认代码块
}