laravel 源码解读 - 简书

// AuthServiceProvider
protected function registerAuthenticator()
{
    $this->app->singleton('auth', function ($app) {
        // Once the authentication service has actually been requested by the developer
        // we will set a variable in the application indicating such. This helps us
        // know that we need to set any queued cookies in the after event later.
        $app['auth.loaded'] = true;

        return new AuthManager($app);
    });

    $this->app->singleton('auth.driver', function ($app) {
        return $app['auth']->guard();
    });
}

// 需要使用 Auth 服务
$auth = $app['auth']

// 框架提供的注册功能
/**
 * Handle a registration request for the application.
 *
 * @param  \Illuminate\Http\Request  $request
 * @return \Illuminate\Http\Response
 */
public function register(Request $request)
{
    $this->validator($request->all())->validate();

    event(new Registered($user = $this->create($request->all())));

    $this->guard()->login($user);

    return $this->registered($request, $user)
                    ?: redirect($this->redirectPath());
}

// laravel/framework/src/composer.json
"autoload": {
    "files": [
        "src/Illuminate/Foundation/helpers.php",
        "src/Illuminate/Support/helpers.php"
    ],
    "psr-4": {
        "Illuminate\\": "src/Illuminate/"
    }
},

// 核心函数
function app($abstract = null, array $parameters = [])
{
    if (is_null($abstract)) {
        return Container::getInstance(); // 相当于上面的 $app
    }

    return Container::getInstance()->make($abstract, $parameters); // 相当于上面的 $app['auth']
}

// 使用效果
app() -> $app
app('auth') -> $app['auth']

// 实现
function cache()
{
    $arguments = func_get_args();

    if (empty($arguments)) {
        return app('cache');
    }

    if (is_string($arguments[0])) {
        return app('cache')->get($arguments[0], $arguments[1] ?? null);
    }

    if (! is_array($arguments[0])) {
        throw new Exception(
            'When setting a value in the cache, you must pass an array of key / value pairs.'
        );
    }

    if (! isset($arguments[1])) {
        throw new Exception(
            'You must specify an expiration time when setting a value in the cache.'
        );
    }

    return app('cache')->put(key($arguments[0]), reset($arguments[0]), $arguments[1]);
}

// 使用效果
cache($key); // 获取缓存
cache($key, $value); // 设置缓存

\Cache::get($key);
\Cache::set($key, $value);

namespace Illuminate\Support\Facades;

class Cache extends Facade
{
    protected static function getFacadeAccessor() // 只需要实现这个函数就好
    {
        return 'cache';
    }
}

// 魔法函数
public static function __callStatic($method, $args)
{
    $instance = static::getFacadeRoot(); // 上面实现的 getFacadeAccessor() 就在这里使用到, 最后其实返回的 $app['cache']

    if (! $instance) {
        throw new RuntimeException('A facade root has not been set.');
    }

    return $instance->$method(...$args);
}

// 书写控制器代码时, 有 2 种方式:

public function index(Request $request)
{
    $input = $request->all();
}

public function index()
{
    $input = Request::all();
}

Cache::get($key, $timeout); // 缓存可以设置过期时间, Cache Facade 直接加一下参数就行了

cache()->get($key, $timeout); // Cache helper function 没有封装, 所有要先用 cache() 来返回 $app['cache'], 然后再调用

// CacheServiceProvider 中这样注册的服务
public function register()
{
    $this->app->singleton('cache', function ($app) { // 这就是我们常用的 $app['cache'], 实际使用的 CacheManager
        return new CacheManager($app);
    });

    $this->app->singleton('cache.store', function ($app) { // 继续看
        return $app['cache']->driver();
    });

    ...
}

// CacheManager
// 魔法函数, 比如执行 $app['cahe']->get($key), 其实最终执行的 $this->store()->get($key)
public function __call($method, $parameters)
{
    return $this->store()->$method(...$parameters); 
}
public function store($name = null)
{
    $name = $name ?: $this->getDefaultDriver();

    return $this->stores[$name] = $this->get($name);
}