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PHP 代码重构技巧

  • 2026-03-07 21:06:01
PHP 代码重构技巧

重构 = 在不改变外部行为的前提下,改善代码内部结构。


为什么要重构

  • 代码难以理解
  • 修改困难,容易出 bug
  • 重复代码多
  • 性能问题
  • 技术债务累积

重构时机

时机
说明
添加功能前
先重构再加功能
修复 Bug 时
顺便改善代码
Code Review
发现问题及时改
理解代码时
边读边重构

常见代码坏味道

1. 过长函数

// ❌ 坏代码:函数太长
functionprocessOrder($order){
// 验证订单... 50行
// 计算价格... 30行
// 检查库存... 40行
// 创建订单... 20行
// 发送通知... 30行
}

// ✅ 重构后:拆分成小函数
functionprocessOrder($order){
$this->validateOrder($order);
    $total = $this->calculateTotal($order);
$this->checkInventory($order);
    $orderId = $this->createOrder($order, $total);
$this->sendNotification($orderId);
return $orderId;
}

2. 重复代码

// ❌ 坏代码:重复逻辑
functiongetUserById($id){
    $pdo = new PDO($dsn, $user, $pass);
    $stmt = $pdo->prepare("SELECT * FROM users WHERE id = ?");
    $stmt->execute([$id]);
return $stmt->fetch();
}

functiongetOrderById($id){
    $pdo = new PDO($dsn, $user, $pass);
    $stmt = $pdo->prepare("SELECT * FROM orders WHERE id = ?");
    $stmt->execute([$id]);
return $stmt->fetch();
}

// ✅ 重构后:提取公共方法
classBaseRepository{
protected PDO $pdo;
protected string $table;

publicfunctionfindById($id){
        $stmt = $this->pdo->prepare(
"SELECT * FROM {$this->table} WHERE id = ?"
        );
        $stmt->execute([$id]);
return $stmt->fetch();
    }
}

3. 过长参数列表

// ❌ 坏代码:参数太多
functioncreateUser($name, $email, $phone, $address, $city, $country, $zip){
// ...
}

// ✅ 重构后:使用对象
classCreateUserRequest{
public string $name;
public string $email;
public string $phone;
public Address $address;
}

functioncreateUser(CreateUserRequest $request){
// ...
}

4. 条件复杂度

// ❌ 坏代码:嵌套太深
functiongetDiscount($user, $order){
if ($user->isVip()) {
if ($order->total > 1000) {
if ($order->items > 5) {
return0.3;
            } else {
return0.2;
            }
        } else {
return0.1;
        }
    } else {
if ($order->total > 500) {
return0.05;
        }
return0;
    }
}

// ✅ 重构后:提前返回 + 策略模式
functiongetDiscount($user, $order)float{
if (!$user->isVip()) {
return $order->total > 500 ? 0.05 : 0;
    }

if ($order->total <= 1000) {
return0.1;
    }

return $order->items > 5 ? 0.3 : 0.2;
}

5. 魔法数字

// ❌ 坏代码:魔法数字
if ($status == 1) {
// ...
elseif ($status == 2) {
// ...
}

// ✅ 重构后:使用常量或枚举
classOrderStatus{
const PENDING = 1;
const PAID = 2;
const SHIPPED = 3;
const COMPLETED = 4;
}

if ($status == OrderStatus::PENDING) {
// ...
}

// PHP 8.1+ 枚举
enum OrderStatus: int {
case Pending = 1;
case Paid = 2;
case Shipped = 3;
}

重构手法

提取方法

// 重构前
functionprintOwing(){
$this->printBanner();

// 打印详情
echo"name: " . $this->name . "\n";
echo"amount: " . $this->getOutstanding() . "\n";
}

// 重构后
functionprintOwing(){
$this->printBanner();
$this->printDetails();
}

privatefunctionprintDetails(){
echo"name: " . $this->name . "\n";
echo"amount: " . $this->getOutstanding() . "\n";
}

内联方法

// 重构前:方法过于简单
functiongetRating(){
return$this->moreThanFiveLateDeliveries() ? 2 : 1;
}

functionmoreThanFiveLateDeliveries(){
return$this->numberOfLateDeliveries > 5;
}

// 重构后:内联
functiongetRating(){
return$this->numberOfLateDeliveries > 5 ? 2 : 1;
}

提取变量

// 重构前
if ($platform->toUpperCase()->indexOf("MAC") > -1 &&
    $browser->toUpperCase()->indexOf("IE") > -1 &&
$this->wasInitialized() && $this->resize > 0) {
// ...
}

// 重构后
$isMacOs = $platform->toUpperCase()->indexOf("MAC") > -1;
$isIE = $browser->toUpperCase()->indexOf("IE") > -1;
$wasResized = $this->wasInitialized() && $this->resize > 0;

if ($isMacOs && $isIE && $wasResized) {
// ...
}

以查询取代临时变量

// 重构前
$basePrice = $this->quantity * $this->itemPrice;
if ($basePrice > 1000) {
return $basePrice * 0.95;
}
return $basePrice * 0.98;

// 重构后
if ($this->basePrice() > 1000) {
return$this->basePrice() * 0.95;
}
return$this->basePrice() * 0.98;

privatefunctionbasePrice(){
return$this->quantity * $this->itemPrice;
}

引入参数对象

// 重构前
functionamountInvoiced($startDate, $endDate){ }
functionamountReceived($startDate, $endDate){ }
functionamountOverdue($startDate, $endDate){ }

// 重构后
classDateRange{
publicfunction__construct(
        public \DateTime $start,
        public \DateTime $end
    )
{}
}

functionamountInvoiced(DateRange $range){ }
functionamountReceived(DateRange $range){ }
functionamountOverdue(DateRange $range){ }

以多态取代条件

// 重构前
functiongetSpeed(){
return match ($this->type) {
'european' => $this->getBaseSpeed(),
'african' => $this->getBaseSpeed() - $this->getLoadFactor(),
'norwegian_blue' => $this->isNailed ? 0 : $this->getBaseSpeed(),
    };
}

// 重构后
abstractclassBird{
abstractfunctiongetSpeed();
}

classEuropeanextendsBird{
functiongetSpeed(){
return$this->getBaseSpeed();
    }
}

classAfricanextendsBird{
functiongetSpeed(){
return$this->getBaseSpeed() - $this->getLoadFactor();
    }
}

重构实战案例

案例:订单处理

// 重构前:一个大方法
classOrderProcessor{
publicfunctionprocess($data){
// 验证
if (empty($data['user_id'])) {
thrownewException('用户ID不能为空');
        }
if (empty($data['items'])) {
thrownewException('商品不能为空');
        }

// 计算价格
        $total = 0;
foreach ($data['items'as $item) {
            $product = Product::find($item['product_id']);
            $total += $product->price * $item['quantity'];
        }

// 应用折扣
        $user = User::find($data['user_id']);
if ($user->vip_level >= 2) {
            $total *= 0.9;
        } elseif ($user->vip_level == 1) {
            $total *= 0.95;
        }

// 创建订单
        $order = new Order();
        $order->user_id = $data['user_id'];
        $order->total = $total;
        $order->save();

// 创建订单项
foreach ($data['items'as $item) {
            $orderItem = new OrderItem();
            $orderItem->order_id = $order->id;
            $orderItem->product_id = $item['product_id'];
            $orderItem->quantity = $item['quantity'];
            $orderItem->save();
        }

// 发送通知
        Mail::send($user->email, '订单创建成功''...');

return $order;
    }
}
// 重构后:职责分离
classOrderProcessor{
publicfunction__construct(
        private OrderValidator $validator,
        private PriceCalculator $calculator,
        private OrderRepository $repository,
        private NotificationService $notifier,
    )
{}

publicfunctionprocess(array $data)Order{
$this->validator->validate($data);

        $total = $this->calculator->calculate($data);
        $order = $this->repository->create($data, $total);

$this->notifier->orderCreated($order);

return $order;
    }
}

classOrderValidator{
publicfunctionvalidate(array $data)void{
if (empty($data['user_id'])) {
thrownew ValidationException('用户ID不能为空');
        }
if (empty($data['items'])) {
thrownew ValidationException('商品不能为空');
        }
    }
}

classPriceCalculator{
publicfunctioncalculate(array $data)float{
        $subtotal = $this->calculateSubtotal($data['items']);
        $discount = $this->getDiscount($data['user_id']);

return $subtotal * (1 - $discount);
    }

privatefunctioncalculateSubtotal(array $items)float{
return array_reduce($items, function($total, $item){
            $product = Product::find($item['product_id']);
return $total + $product->price * $item['quantity'];
        }, 0);
    }

privatefunctiongetDiscount(int $userId)float{
        $user = User::find($userId);

return match (true) {
            $user->vip_level >= 2 => 0.1,
            $user->vip_level == 1 => 0.05,
default => 0,
        };
    }
}

重构工具

工具
用途
PHPStan
静态分析
Rector
自动重构
PHP CS Fixer
代码风格
IDE 重构功能
提取方法、重命名等

Rector 自动重构

composer require rector/rector --dev
// rector.php
useRector\Config\RectorConfig;
useRector\Set\ValueObject\SetList;

returnstaticfunction(RectorConfig $config)void{
    $config->paths([__DIR__ . '/src']);

    $config->sets([
        SetList::PHP_80,
        SetList::PHP_81,
        SetList::CODE_QUALITY,
        SetList::DEAD_CODE,
    ]);
};
# 预览变更
vendor/bin/rector process --dry-run

# 执行重构
vendor/bin/rector process

重构原则

  1. 小步前进,频繁测试
  2. 先写测试,再重构
  3. 一次只做一件事
  4. 保持代码可运行
  5. 重构与功能开发分开

总结

重构目标:
- 提高可读性
- 降低复杂度
- 消除重复
- 便于扩展

常用手法:
- 提取方法/类
- 引入参数对象
- 以多态取代条件
- 提前返回

记住:重构是持续的过程,不是一次性任务。

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  1. CONNECT:[ UseTime:0.000555s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000653s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002128s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000579s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000581s ]
  6. SELECT * FROM `set` [ RunTime:0.000808s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000612s ]
  8. SELECT * FROM `article` WHERE `id` = 477865 LIMIT 1 [ RunTime:0.000454s ]
  9. UPDATE `article` SET `lasttime` = 1774614498 WHERE `id` = 477865 [ RunTime:0.004885s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000290s ]
  11. SELECT * FROM `article` WHERE `id` < 477865 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000486s ]
  12. SELECT * FROM `article` WHERE `id` > 477865 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000405s ]
  13. SELECT * FROM `article` WHERE `id` < 477865 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000882s ]
  14. SELECT * FROM `article` WHERE `id` < 477865 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000830s ]
  15. SELECT * FROM `article` WHERE `id` < 477865 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002836s ]
0.128430s