下面由laravel教程栏目给大家介绍laravel的$this->app以及app()是怎么来的，希望对需要的朋友有所帮助！
断点调试寻找对应文件，忽略次要步骤，仅描述核心动作，‘/’表示index.php所在目录
地址:index.php
$app = require_once __DIR__.'/../bootstrap/app.php';
$app初始化
路径/…/bootstrap/app.php
$app = new Illuminate\Foundation\Application(
realpath(__DIR__.'/../')
);//$app初始化工作$app初始化的类及构造函数
class Application extends Container implements ApplicationContract,HttpKernelInterface
{
//继承Container类，Container类实现应用契约接口与请求接口
public function __construct($basePath = null){
if ($basePath) {//$basePath = '/../'
$this->setBasePath($basePath);//路径绑定
}
$this->registerBaseBindings();//基础绑定
$this->registerBaseServiceProviders();//注册基础服务提供者
$this->registerCoreContainerAliases();//注册别名
}
}路径绑定
Application的setBasePath(’/…/’)方法调用Container的instance(a b s t r a c t , abstract,abstract,instance)方法赋值Contaienr类instances instances: array:9 [▼ “path” => “\var\www\app” “path.base” => “\var\www” “path.lang” => “\var\www\resources\lang” “path.config” => “\var\www\config” “path.public” => “\var\www\public” “path.storage” => “\var\www\storage” “path.database” => “\var\www\database” “path.resources” => “\var\www\resources” “path.bootstrap” => “\var\www\bootstrap” ]
基础绑定
向Container的instances中添加绑定
"app" => Application {#2}
"Illuminate\Container\Container" => Application {#2}
"Illuminate\Foundation\PackageManifest" => PackageManifest {#4 ▼
+files: Filesystem {#5}
+basePath: "\var\www"
+vendorPath: "\var\www\vendor"
+manifestPath: "\var\www\bootstrap\cache\packages.php"
+manifest: null
}app与Container指向当前实例
PackageMainfest 为包管理实例，构造方法中files注册文件系统实例
注册基础服务提供者
//class Application
protected function registerBaseServiceProviders()
{
$this->register(new EventServiceProvider($this));
$this->register(new LogServiceProvider($this));
$this->register(new RoutingServiceProvider($this));
}Event、Log、Routing基础服务继承ServiceProvider，初始化的时候将app属性赋值Application实例
//class ServiceProvider
public function __construct($app)
{
$this->app = $app;
}执行Application类register方法
//Application
public function register($provider, $options = [], $force = false)
{
if (is_string($provider)) {
$provider = $this->resolveProvider($provider);
}
if (method_exists($provider, 'register')) {
$provider->register();//赋值bindings
}
//将服务提供者添加到serviceProviders属性队列
//将服务提供者类名添加到loaderProviders属性
$this->markAsRegistered($provider);
return $provider;
}为provider注册提供了两种方法；
一种是字符串类名直接实例，
一种是执行$$provider->register()方法注册，
当前执行第二种方法，
回看当前EventServiceProvider实例的register方法
public function register()
{
$this->app->singleton('events', function ($app) {
return (new Dispatcher($app))->setQueueResolver(function () use ($app) {
return $app->make(QueueFactoryContract::class);
});
});
}调用Application实例的singleton方法
//class Continer
public function singleton($abstract, $concrete = null)
{
$this->bind($abstract, $concrete, true);
}调用bind方法，赋值bindings
//class Container
public function bind($abstract, $concrete = null, $shared = false)
{
if (is_null($concrete)) {
$concrete = $abstract;
}
if (! $concrete instanceof Closure) {
$concrete = $this->getClosure($abstract, $concrete);
}
$this->bindings[$abstract] = compact('concrete', 'shared');
}回到Application类register方法中并执行markAsRegistered($provider)
//class Application
protected function markAsRegistered($provider)
{
$this->serviceProviders[] = $provider;
$this->loadedProviders[get_class($provider)] = true;
}LogServerProvider、RoutingServiceProvider与之类似
别名绑定
//class Application
public function registerCoreContainerAliases()
{
foreach ([
'app' => [self::class, \Illuminate\Contracts\Container\Container::class, \Illuminate\Contracts\Foundation\Application::class, \Psr\Container\ContainerInterface::class],
'auth' => [\Illuminate\Auth\AuthManager::class, \Illuminate\Contracts\Auth\Factory::class],
'auth.driver' => [\Illuminate\Contracts\Auth\Guard::class],
'blade.compiler' => [\Illuminate\View\Compilers\BladeCompiler::class],
'cache' => [\Illuminate\Cache\CacheManager::class, \Illuminate\Contracts\Cache\Factory::class],
'cache.store' => [\Illuminate\Cache\Repository::class, \Illuminate\Contracts\Cache\Repository::class],
'config' => [\Illuminate\Config\Repository::class, \Illuminate\Contracts\Config\Repository::class],
'cookie' => [\Illuminate\Cookie\CookieJar::class, \Illuminate\Contracts\Cookie\Factory::class, \Illuminate\Contracts\Cookie\QueueingFactory::class],
'encrypter' => [\Illuminate\Encryption\Encrypter::class, \Illuminate\Contracts\Encryption\Encrypter::class],
'db' => [\Illuminate\Database\DatabaseManager::class],
'db.connection' => [\Illuminate\Database\Connection::class, \Illuminate\Database\ConnectionInterface::class],
'events' => [\Illuminate\Events\Dispatcher::class, \Illuminate\Contracts\Events\Dispatcher::class],
'files' => [\Illuminate\Filesystem\Filesystem::class],
'filesystem' => [\Illuminate\Filesystem\FilesystemManager::class, \Illuminate\Contracts\Filesystem\Factory::class],
'filesystem.disk' => [\Illuminate\Contracts\Filesystem\Filesystem::class],
'filesystem.cloud' => [\Illuminate\Contracts\Filesystem\Cloud::class],
'hash' => [\Illuminate\Contracts\Hashing\Hasher::class],
'translator' => [\Illuminate\Translation\Translator::class, \Illuminate\Contracts\Translation\Translator::class],
'log' => [\Illuminate\Log\Writer::class, \Illuminate\Contracts\Logging\Log::class, \Psr\Log\LoggerInterface::class],
'mailer' => [\Illuminate\Mail\Mailer::class, \Illuminate\Contracts\Mail\Mailer::class, \Illuminate\Contracts\Mail\MailQueue::class],
'auth.password' => [\Illuminate\Auth\Passwords\PasswordBrokerManager::class, \Illuminate\Contracts\Auth\PasswordBrokerFactory::class],
'auth.password.broker' => [\Illuminate\Auth\Passwords\PasswordBroker::class, \Illuminate\Contracts\Auth\PasswordBroker::class],
'queue' => [\Illuminate\Queue\QueueManager::class, \Illuminate\Contracts\Queue\Factory::class, \Illuminate\Contracts\Queue\Monitor::class],
'queue.connection' => [\Illuminate\Contracts\Queue\Queue::class],
'queue.failer' => [\Illuminate\Queue\Failed\FailedJobProviderInterface::class],
'redirect' => [\Illuminate\Routing\Redirector::class],
'redis' => [\Illuminate\Redis\RedisManager::class, \Illuminate\Contracts\Redis\Factory::class],
'request' => [\Illuminate\Http\Request::class, \Symfony\Component\HttpFoundation\Request::class],
'router' => [\Illuminate\Routing\Router::class, \Illuminate\Contracts\Routing\Registrar::class, \Illuminate\Contracts\Routing\BindingRegistrar::class],
'session' => [\Illuminate\Session\SessionManager::class],
'session.store' => [\Illuminate\Session\Store::class, \Illuminate\Contracts\Session\Session::class],
'url' => [\Illuminate\Routing\UrlGenerator::class, \Illuminate\Contracts\Routing\UrlGenerator::class],
'validator' => [\Illuminate\Validation\Factory::class, \Illuminate\Contracts\Validation\Factory::class],
'view' => [\Illuminate\View\Factory::class, \Illuminate\Contracts\View\Factory::class],
] as $key => $aliases) {
foreach ($aliases as $alias) {
$this->alias($key, $alias);
}
}
}为alias属性赋值
$app核心类绑定
/…/bootstrap/app.php
/**
*核心类绑定
*/
$app->singleton(
Illuminate\Contracts\Http\Kernel::class,
App\Http\Kernel::class
);
$app->singleton(
Illuminate\Contracts\Console\Kernel::class,
App\Console\Kernel::class
);
$app->singleton(
Illuminate\Contracts\Debug\ExceptionHandler::class,
App\Exceptions\Handler::class
);调用bind函数
//class Container
public function singleton($abstract, $concrete = null)
{
$this->bind($abstract, $concrete, true);
}对字符串类名进行默认回调函数绑定
//class Container
public function bind($abstract, $concrete = null, $shared = false)
{
// If the factory is not a Closure, it means it is just a class name which is
// bound into this container to the abstract type and we will just wrap it
// up inside its own Closure to give us more convenience when extending.
if (! $concrete instanceof Closure) {
$concrete = $this->getClosure($abstract, $concrete);
}
$this->bindings[$abstract] = compact('concrete', 'shared');
}getClosure返回默认回调函数
//class Container
protected function getClosure($abstract, $concrete)
{
return function ($container, $parameters = []) use ($abstract, $concrete) {
if ($abstract == $concrete) {
return $container->build($concrete);
}
return $container->make($concrete, $parameters);
};
}最终：返回$app
/…/bootstrap/app.php return $app;
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