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。

<?phprequire __DIR__.'/../bootstrap/autoload.php';$app = require_once __DIR__.'/../bootstrap/app.php';/*|--------------------------------------------------------------------------| Run The Application|--------------------------------------------------------------------------|| Once we have the application, we can handle the incoming request| through the kernel, and send the associated response back to| the client's browser allowing them to enjoy the creative| and wonderful application we have prepared for them.|*/$kernel = $app->make(Illuminate/Contracts/Http/Kernel::class);$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/bootstrap/app.php

<?php/*|--------------------------------------------------------------------------| Create The Application|--------------------------------------------------------------------------|| The first thing we will do is create a new Laravel application instance| which serves as the "glue" for all the components of Laravel, and is| the IoC container for the system binding all of the various parts.|*/$app = new Illuminate/Foundation/Application(  realpath(__DIR__.'/../'));/*|--------------------------------------------------------------------------| Bind Important Interfaces|--------------------------------------------------------------------------|| Next, we need to bind some important interfaces into the container so| we will be able to resolve them when needed. The kernels serve the| incoming requests to this application from both the web and CLI.|*/$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);/*|--------------------------------------------------------------------------| 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;