PHP-Laravel核心思想

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控制反转（Inversion of Control，缩写为IoC），是面向对象编程中的一种设计原则，可以用来减低计算机代码之间的耦合度。其中最常见的方式叫做依赖注入（Dependency Injection，简称DI），还有一种方式叫“依赖查找”（Dependency Lookup）。通过控制反转，对象在被创建的时候，由一个调控系统内所有对象的外界实体，将其所依赖的对象的引用传递(注入)给它。

index.php

容器核心思想

bind – 每次通过make实例化新的对象
singleton – 注册单例, 加载后注册至 instances 中
instance – 通过已经实例化的对象注册单例

通过反射将所有的依赖注类递归进行实例化

bootstrap/autoload.php

类自动加载

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<!-- 核心函数 -->
spl_autoload_register

bootstrap/app.php

实例化 Illuminate\Foundation\Application 类

  1. 设置应用程序的基础路径

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    $this->basePath = rtrim($basePath, '\/');
    $this->instance('path', $this->path());
    $this->instance('path.base', $this->basePath());
    $this->instance('path.lang', $this->langPath());
    $this->instance('path.config', $this->configPath());
    $this->instance('path.public', $this->publicPath());
    $this->instance('path.storage', $this->storagePath());
    $this->instance('path.database', $this->databasePath());
    $this->instance('path.resources', $this->resourcePath());
    $this->instance('path.bootstrap', $this->bootstrapPath());

  2. 设置应用程序的基础绑定

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    static::setInstance($this);
    $this->instance('app', $this);
    $this->instance(Container::class, $this);

  3. 注册基础服务提供商 & 绑定基础依赖

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    $this->register(new EventServiceProvider($this));
    $this->register(new LogServiceProvider($this));
    $this->register(new RoutingServiceProvider($this));

    // 注册基础服务提供商
    $this->serviceProviders = [
        '\Illuminate\Events\EventServiceProvider',
        '\Illuminate\Log\LogServiceProvider',
        '\Illuminate\Routing\RoutingServiceProvider',
    ]

    // 绑定基础依赖
    $this->bindings = [
    	'events',
    	'log',
    	'router',
    	'url',
    	'redirect',
    	'Psr\Http\Message\ServerRequestInterface',
    	'Psr\Http\Message\ResponseInterface',
    	'Illuminate\Contracts\Routing\ResponseFactory',
    ]

  4. 注册服务别名

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    $this->aliases = [
        Illuminate\Foundation\Application => "app",
        Illuminate\Contracts\Container\Container => "app",
        Illuminate\Contracts\Foundation\Application => "app",
        Illuminate\Auth\AuthManager => "auth",
        Illuminate\Contracts\Auth\Factory => "auth",
        Illuminate\Contracts\Auth\Guard => "auth.driver",
        Illuminate\View\Compilers\BladeCompiler => "blade.compiler",
        Illuminate\Cache\CacheManager => "cache",
        Illuminate\Contracts\Cache\Factory => "cache",
        Illuminate\Cache\Repository => "cache.store",
        Illuminate\Contracts\Cache\Repository => "cache.store",
        Illuminate\Config\Repository => "config",
        Illuminate\Contracts\Config\Repository => "config",
        Illuminate\Cookie\CookieJar => "cookie",
        Illuminate\Contracts\Cookie\Factory => "cookie",
        Illuminate\Contracts\Cookie\QueueingFactory => "cookie",
        Illuminate\Encryption\Encrypter => "encrypter",
        Illuminate\Contracts\Encryption\Encrypter => "encrypter",
        Illuminate\Database\DatabaseManager => "db",
        Illuminate\Database\Connection => "db.connection",
        Illuminate\Database\ConnectionInterface => "db.connection",
        Illuminate\Events\Dispatcher => "events",
        Illuminate\Contracts\Events\Dispatcher => "events",
        Illuminate\Filesystem\Filesystem => "files",
        Illuminate\Filesystem\FilesystemManager => "filesystem",
        Illuminate\Contracts\Filesystem\Factory => "filesystem",
        Illuminate\Contracts\Filesystem\Filesystem => "filesystem.disk",
        Illuminate\Contracts\Filesystem\Cloud => "filesystem.cloud",
        Illuminate\Contracts\Hashing\Hasher => "hash",
        Illuminate\Translation\Translator => "translator",
        Illuminate\Contracts\Translation\Translator => "translator",
        Illuminate\Log\Writer => "log",
        Illuminate\Contracts\Logging\Log => "log",
        Psr\Log\LoggerInterface => "log",
        Illuminate\Mail\Mailer => "mailer",
        Illuminate\Contracts\Mail\Mailer => "mailer",
        Illuminate\Contracts\Mail\MailQueue => "mailer",
        Illuminate\Auth\Passwords\PasswordBrokerManager => "auth.password",
        Illuminate\Contracts\Auth\PasswordBrokerFactory => "auth.password",
        Illuminate\Auth\Passwords\PasswordBroker => "auth.password.broker",
        Illuminate\Contracts\Auth\PasswordBroker => "auth.password.broker",
        Illuminate\Queue\QueueManager => "queue",
        Illuminate\Contracts\Queue\Factory => "queue",
        Illuminate\Contracts\Queue\Monitor => "queue",
        Illuminate\Contracts\Queue\Queue => "queue.connection",
        Illuminate\Queue\Failed\FailedJobProviderInterface => "queue.failer",
        Illuminate\Routing\Redirector => "redirect",
        Illuminate\Redis\RedisManager => "redis",
        Illuminate\Contracts\Redis\Factory => "redis",
        Illuminate\Http\Request => "request",
        Symfony\Component\HttpFoundation\Request => "request",
        Illuminate\Routing\Router => "router",
        Illuminate\Contracts\Routing\Registrar => "router",
        Illuminate\Contracts\Routing\BindingRegistrar => "router",
        Illuminate\Session\SessionManager => "session",
        Illuminate\Session\Store => "session.store",
        Illuminate\Contracts\Session\Session => "session.store",
        Illuminate\Routing\UrlGenerator => "url",
        Illuminate\Contracts\Routing\UrlGenerator => "url",
        Illuminate\Validation\Factory => "validator",
        Illuminate\Contracts\Validation\Factory => "validator",
        Illuminate\View\Factory => "view",
        Illuminate\Contracts\View\Factory => "view",
    ]

  5. 继续绑定核心依赖

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    $this->bindings = [
    	'events',
    	'log',
    	'router',
    	'url',
    	'redirect',
    	'Psr\Http\Message\ServerRequestInterface',
    	'Psr\Http\Message\ResponseInterface',
    	'Illuminate\Contracts\Routing\ResponseFactory',

    	'Illuminate\Contracts\Http\Kernel',
    	'Illuminate\Contracts\Console\Kernel',
    	'Illuminate\Contracts\Debug\ExceptionHandler',
    ]

  6. 实例化App\Http\Kernel

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    // 设置路由中间件(优先)
    middlewarePriority = [
    	"Illuminate\Session\Middleware\StartSession",
    	"Illuminate\View\Middleware\ShareErrorsFromSession",
    	"Illuminate\Auth\Middleware\Authenticate",
    	"Illuminate\Session\Middleware\AuthenticateSession",
    	"Illuminate\Routing\Middleware\SubstituteBindings",
    	"Illuminate\Auth\Middleware\Authorize",
    ]

    // 设置路由中间件分组
    middlewareGroups = [
    	web = [
    		"App\Http\Middleware\EncryptCookies",
    		"Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse",
    		"Illuminate\Session\Middleware\StartSession",
    		"Illuminate\View\Middleware\ShareErrorsFromSession",
    		"App\Http\Middleware\VerifyCsrfToken",
    		"Illuminate\Routing\Middleware\SubstituteBindings",
    	]
    	api = [
    		"throttle:60,1",
    		"bindings",
    	]
    ]

    // 设置中间件
    middleware = [
    	"Illuminate\Auth\Middleware\Authenticate",
    	"Illuminate\Auth\Middleware\AuthenticateWithBasicAuth",
    	"Illuminate\Routing\Middleware\SubstituteBindings",
    	"Illuminate\Auth\Middleware\Authorize",
    	"App\Http\Middleware\RedirectIfAuthenticated",
    	"Illuminate\Routing\Middleware\ThrottleRequests",
    	"Laravel\Passport\Http\Middleware\CheckScopes",
    	"Laravel\Passport\Http\Middleware\CheckForAnyScope",
    ]

  7. 开启对_method请求参数的支持

  8. $request是经过Symfony封装的请求对象
  9. 注册request实例到容器 ($app[‘request’]->Illuminate\Http\Request)
  10. 清空之前容器中的request实例
  11. 调用bootstrap方法，启动一系列启动类的bootstrap方法：
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    - Illuminate\Foundation\Bootstrap\DetectEnvironment 环境配置（$app[‘env’]）
    - Illuminate\Foundation\Bootstrap\LoadConfiguration  基本配置（$app[‘config’]）
    - Illuminate\Foundation\Bootstrap\ConfigureLogging   日志文件（$app[‘log’]）
    - Illuminate\Foundation\Bootstrap\HandleExceptions   错误&异常处理
    - Illuminate\Foundation\Bootstrap\RegisterFacades    清除已解析的Facade并重新启动，注册config文件中alias定义的所有Facade类到容器
    - Illuminate\Foundation\Bootstrap\RegisterProviders  注册config中providers定义的所有Providers类到容器
    - Illuminate\Foundation\Bootstrap\BootProviders      调用所有已注册Providers的boot方法

  13. 通过Pipeline发送请求，经过中间件，再由路由转发，最终返回响应

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