Laravel框架生命周期与原理分析

本文实例讲述了Laravel框架生命周期与原理。分享给大家供大家参考,具体如下:

引言:

如果你对一件工具的使用原理了如指掌,那么你在用这件工具的时候会充满信心!

正文:

一旦用户(浏览器)发送了一个HTTP请求,我们的apache或者nginx一般都转到index.php,因此,之后的一系列步骤都是从index.php开始的,我们先来看一看这个文件代码。

make(Illuminate\Contracts\Http\Kernel::class); $response = $kernel->handle( $request = Illuminate\Http\Request::capture() ); $response->send(); $kernel->terminate($request,$response);

作者在注释里谈了kernel的作用,kernel的作用,kernel处理来访的请求,并且发送相应返回给用户浏览器。

这里又涉及到了一个app对象,所以附上app对象,所以附上app对象的源码,这份源码是

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 ); /* |-------------------------------------------------------------------------- | Return The Application |-------------------------------------------------------------------------- | | This script returns the application instance. The instance is given to | the calling script so we can separate the building of the instances | from the actual running of the application and sending responses. | */ return $app;

请看app变量是

setBasePath($basePath); } $this->registerBaseBindings(); $this->registerBaseServiceProviders(); $this->registerCoreContainerAliases(); }

构造器做了3件事,前两件事很好理解,创建Container,注册了ServiceProvider,看代码

instance('app',$this); $this->instance(Container::class,$this); } /** * Register all of the base service providers. * * @return void */ protected function registerBaseServiceProviders() { $this->register(new EventServiceProvider($this)); $this->register(new LogServiceProvider($this)); $this->register(new RoutingServiceProvider($this)); }

最后一件事,是做了个很大的数组,定义了大量的别名,侧面体现程序员是聪明的懒人。

[\Illuminate\Foundation\Application::class,\Illuminate\Contracts\Container\Container::class,\Illuminate\Contracts\Foundation\Application::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],]; foreach ($aliases as $key => $aliases) { foreach ($aliases as $alias) { $this->alias($key,$alias); } } }

这里出现了一个instance函数,其实这并不是Application类的函数,而是Application类的父类Container类的函数

removeAbstractAlias($abstract); unset($this->aliases[$abstract]); // We'll check to determine if this type has been bound before,and if it has // we will fire the rebound callbacks registered with the container and it // can be updated with consuming classes that have gotten resolved here. $this->instances[$abstract] = $instance; if ($this->bound($abstract)) { $this->rebound($abstract); } }

Application是Container的子类,所以$app不仅是Application类的对象,还是Container的对象,所以,新出现的

$app对象声明了3个单例模型对象,分别是

大家有没有发现,index.php中也有一个$kernel变量,但是只保存了make出来的HttpKernel变量,因此本文不再讨论,ConsoleKernel,ExceptionHandler。。。

继续在文件夹下找到

[ \App\Http\Middleware\EncryptCookies::class,\Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,\Illuminate\Session\Middleware\StartSession::class,\Illuminate\View\Middleware\ShareErrorsFromSession::class,\App\Http\Middleware\VerifyCsrfToken::class,],'api' => [ 'throttle:60,1',]; /** * The application's route middleware. * * These middleware may be assigned to groups or used individually. * * @var array */ protected $routeMiddleware = [ 'auth' => \App\Http\Middleware\Authenticate::class,'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,'mymiddleware'=>\App\Http\Middleware\MyMiddleware::class,]; }

一目了然,HttpKernel里定义了中间件数组。

该做的做完了,就开始了请求到响应的过程,见index.php

handle( $request = Illuminate\Http\Request::capture() ); $response->send();

最后在中止,释放所有资源。

terminateMiddleware($request,$response); $this->app->terminate(); }

总结一下,简单归纳整个过程就是:

1.index.php加载

2.使用app这个对象,创建1个单例模式的对象HttpKernel,在创建HttpKernel时调用了构造函数,完成了中间件的声明。

3.以上这些工作都是在请求来访之前完成的,接下来开始等待请求,然后就是:

更多关于Laravel相关内容感兴趣的读者可查看本站专题:《》、《》、《》、《》及《

希望本文所述对大家基于Laravel框架的PHP程序设计有所帮助。

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