代码重构：提升函数可读性与可维护性

protected function execute(InputInterface $input, OutputInterface $output): int
{
    $this->setDrinkType($input);

    if (in_array($this->drinkType, $this->allowedDrinkTypes)) {
        // ... 饮料类型合法，继续处理 ...
        $money = $input->getArgument('money');
        switch ($this->drinkType) {
            case 'tea':
                if ($money < 0.4) {
                    $output->writeln('The tea costs 0.4');
                    return 0;
                }
                break;
            case 'coffee':
                if ($money < 0.5) {
                    $output->writeln('The coffee costs 0.5');
                    return 0;
                }
                break;
            case 'chocolate':
                if ($money < 0.6) {
                    $output->writeln('The chocolate costs 0.6');
                    return 0;
                }
                break;
        }
        if ($this->hasCorrectSugars($input)) {
            $this->checkSugars($input, $output);
            return 0;
        }
        $output->writeln('The number of sugars should be between 0 and 2');
        return 0;
    }
    $output->writeln('The drink type should be tea, coffee or chocolate');
    return 0;
}

protected function hasCorrectSugars($input): bool
{
    $sugars = $input->getArgument('sugars');
    return ($sugars >= $this->minSugars && $sugars <= $this->maxSugars);
}

protected function checkSugars($input, $output): void
{
    $sugars = $input->getArgument('sugars');
    $output->write('You have ordered a ' . $this->drinkType);
    $this->isExtraHot($input, $output); // 假设存在此方法
    $output->write(' with ' . $sugars . ' sugars');
    if ($sugars > 0) {
        $output->write(' (stick included)');
    }
    $output->writeln('');
}

protected function execute(InputInterface $input, OutputInterface $output): int
{
    $this->setDrinkType($input);

    // 卫语句：处理非法饮料类型
    if (!in_array($this->drinkType, $this->allowedDrinkTypes)) {
        $output->writeln('The drink type should be tea, coffee or chocolate');
        return 1; // 返回非0表示失败
    }

    // 后续逻辑将在此处开始，不再嵌套
    // ...
}

protected function execute(InputInterface $input, OutputInterface $output): int
{
    $this->setDrinkType($input);

    if (!in_array($this->drinkType, $this->allowedDrinkTypes)) {
        $output->writeln('The drink type should be tea, coffee or chocolate');
        return 1;
    }

    // 使用数据映射存储饮料成本，可作为类成员变量
    $drinkCosts = [
        'tea' => 0.4,
        'coffee' => 0.5,
        'chocolate' => 0.6
    ];

    $money = $input->getArgument('money');
    $drinkCost = $drinkCosts[$this->drinkType]; // 从映射中获取成本

    // 卫语句：检查金额是否足够
    if ($money < $drinkCost) {
        $output->writeln('The ' . $this->drinkType . ' costs ' . $drinkCost);
        return 1;
    }

    // ... 继续处理糖量和订单输出 ...
}

protected function execute(InputInterface $input, OutputInterface $output): int
{
    $this->setDrinkType($input);

    if (!in_array($this->drinkType, $this->allowedDrinkTypes)) {
        $output->writeln('The drink type should be tea, coffee or chocolate');
        return 1;
    }

    $drinkCosts = [
        'tea' => 0.4,
        'coffee' => 0.5,
        'chocolate' => 0.6
    ];

    $money = $input->getArgument('money');
    $drinkCost = $drinkCosts[$this->drinkType];

    if ($money < $drinkCost) {
        $output->writeln('The ' . $this->drinkType . ' costs ' . $drinkCost);
        return 1;
    }

    // 卫语句：检查糖量是否正确
    if (!$this->hasCorrectSugars($input)) {
        $output->writeln('The number of sugars should be between 0 and 2');
        return 1;
    }

    // 所有验证通过，执行订单输出逻辑
    $this->checkSugars($input, $output);

    return 0; // 成功返回0
}

// hasCorrectSugars 保持不变，它只负责验证
protected function hasCorrectSugars($input): bool
{
    $sugars = $input->getArgument('sugars');
    return ($sugars >= $this->minSugars && $sugars <= $this->maxSugars);
}

// checkSugars 保持不变，它只负责输出
protected function checkSugars($input, $output): void
{
    $sugars = $input->getArgument('sugars');
    $output->write('You have ordered a ' . $this->drinkType);
    $this->isExtraHot($input, $output);
    $output->write(' with ' . $sugars . ' sugars');
    if ($sugars > 0) {
        $output->write(' (stick included)');
    }
    $output->writeln('');
}

<?php

use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class OrderProcessor
{
    protected string $drinkType;
    protected array $allowedDrinkTypes = ['tea', 'coffee', 'chocolate'];
    protected float $minSugars = 0;
    protected float $maxSugars = 2;

    // 建议将此映射作为类属性或通过构造函数注入
    protected array $drinkCosts = [
        'tea' => 0.4,
        'coffee' => 0.5,
        'chocolate' => 0.6
    ];

    protected function setDrinkType(InputInterface $input): void
    {
        // 假设此处从输入中获取并设置 $this->drinkType
        $this->drinkType = $input->getArgument('drinkType');
    }

    // 假设存在此方法，用于处理是否额外加热
    protected function isExtraHot(InputInterface $input, OutputInterface $output): void
    {
        // 示例逻辑
        if ($input->getOption('extraHot')) {
            $output->write(' (extra hot)');
        }
    }

    /**
     * 执行饮料订单处理逻辑。
     *
     * @param InputInterface $input
     * @param OutputInterface $output
     * @return int 0 表示成功，非0表示失败。
     */
    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $this->setDrinkType($input);

        // 1. 验证饮料类型
        if (!in_array($this->drinkType, $this->allowedDrinkTypes)) {
            $output->writeln('The drink type should be tea, coffee or chocolate');
            return 1;
        }

        // 2. 验证金额是否足够
        $money = $input->getArgument('money');
        $drinkCost = $this->drinkCosts[$this->drinkType] ?? null; // 使用 null 合并操作符处理不存在的键

        if ($drinkCost === null) {
            // 理论上不会发生，因为 drinkType 已经通过 allowedDrinkTypes 验证
            $output->writeln('Invalid drink type configuration.');
            return 1;
        }

        if ($money < $drinkCost) {
            $output->writeln('The ' . $this->drinkType . ' costs ' . $drinkCost);
            return 1;
        }

        // 3. 验证糖量
        if (!$this->hasCorrectSugars($input)) {
            $output->writeln('The number of sugars should be between ' . $this->minSugars . ' and ' . $this->maxSugars);
            return 1;
        }

        // 4. 所有验证通过，输出订单详情
        $this->checkSugars($input, $output);

        return 0; // 成功
    }

    /**
     * 检查糖量是否在允许范围内。
     *
     * @param InputInterface $input
     * @return bool
     */
    protected function hasCorrectSugars(InputInterface $input): bool
    {
        $sugars = $input->getArgument('sugars');
        // 确保 $sugars 是数值类型，避免潜在的类型比较问题
        return is_numeric($sugars) && ($sugars >= $this->minSugars && $sugars <= $this->maxSugars);
    }

    /**
     * 输出订单的糖量信息。
     *
     * @param InputInterface $input
     * @param OutputInterface $output
     * @return void
     */
    protected function checkSugars(InputInterface $input, OutputInterface $output): void
    {
        $sugars = $input->getArgument('sugars');

        $output->write('You have ordered a ' . $this->drinkType);
        $this->isExtraHot($input, $output);
        $output->write(' with ' . $sugars . ' sugars');
        if ($sugars > 0) {
            $output->write(' (stick included)');
        }
        $output->writeln('');
    }
}