php中的反射(Reflection) API怎么用 php反射API使用方法与实例

ReflectionClass

class MyService {
    private $config;

    public function __construct(array $config) {
        $this->config = $config;
    }

    public function process(string $data): string {
        return "Processing '{$data}' with config: " . json_encode($this->config);
    }

    private function log($message) {
        // ... logging logic
    }
}

MyService

ReflectionClass

$reflector = new ReflectionClass(MyService::class);
echo "类名: " . $reflector->getName() . "\n";
echo "是否抽象: " . ($reflector->isAbstract() ? '是' : '否') . "\n";
echo "是否最终类: " . ($reflector->isFinal() ? '是' : '否') . "\n";

$methods = $reflector->getMethods();
echo "--- 方法列表 ---\n";
foreach ($methods as $method) {
    echo "  方法名: " . $method->getName() . "\n";
    echo "  是否公开: " . ($method->isPublic() ? '是' : '否') . "\n";
    echo "  是否静态: " . ($method->isStatic() ? '是' : '否') . "\n";

    // 检查参数
    $parameters = $method->getParameters();
    if (!empty($parameters)) {
        echo "    参数:\n";
        foreach ($parameters as $param) {
            echo "      - " . $param->getName();
            if ($param->hasType()) {
                echo " (" . $param->getType()->getName() . ")";
            }
            if ($param->isOptional()) {
                echo " (可选, 默认值: " . json_encode($param->getDefaultValue()) . ")";
            }
            echo "\n";
        }
    }
}

// 假设我们有一个配置数组
$myConfig = ['env' => 'dev', 'version' => '1.0'];

// 通过反射创建实例
// 如果构造函数有参数，需要提供它们
$instance = $reflector->newInstanceArgs([$myConfig]);
// 或者如果你知道构造函数没有参数，可以直接 $reflector->newInstance();

// 获取并调用一个公开方法
$processMethod = $reflector->getMethod('process');
$result = $processMethod->invoke($instance, 'some important data'); // invoke的第一个参数是对象实例
echo "调用 process 方法结果: " . $result . "\n";

// 调用私有或受保护方法 (需要设置可访问性)
$logMethod = $reflector->getMethod('log');
$logMethod->setAccessible(true); // 允许访问私有方法
$logMethod->invoke($instance, 'This is a private log message via reflection.');
echo "已通过反射调用私有log方法。\n";

$configProperty = $reflector->getProperty('config');
$configProperty->setAccessible(true); // 允许访问私有属性

// 获取属性值
$currentConfig = $configProperty->getValue($instance);
echo "当前配置: " . json_encode($currentConfig) . "\n";

// 修改属性值
$configProperty->setValue($instance, ['env' => 'prod', 'version' => '2.0']);
$newConfig = $configProperty->getValue($instance);
echo "修改后的配置: " . json_encode($newConfig) . "\n";

ReflectionClass

ReflectionMethod::getParameters()

new

ReflectionProperty

class UserController {
    #[Route('/users/{id}', methods: ['GET'])]
    public function getUser(int $id) { /* ... */ }
}

ReflectionClass

ReflectionMethod

Route

/users/123

UserController::getUser(123)

ReflectionMethod::setAccessible(true)

->

::

ReflectionException

ReflectionClass

ReflectionMethod

ReflectionProperty