laravel8源码剖析index.php运行过程

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首先打开index.php

define('LARAVEL_START', microtime(true));    //常量定义

require __DIR__.'/../vendor/autoload.php';    //引入自动加载

$app = require_once __DIR__.'/../bootstrap/app.php';    //获取app实例

打开bootstrap/app.php

首先new了一个Application类实例，传入了路径参数，初始文件所处目录的上级目录，末尾也不带斜杠，也可以通过APP_BASE_PATH设置

$app = new Illuminate\Foundation\Application(
    $_ENV['APP_BASE_PATH'] ?? dirname(__DIR__)    //项目根目录，例如blog
);

进入Application类中，首先执行的是构造方法

public function __construct($basePath = null)
    {
        if ($basePath) {
            $this->setBasePath($basePath);
        }

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

首先看$this->setBasePath($basePath);

public function setBasePath($basePath)
    {
        $this->basePath = rtrim($basePath, '\/');    //这里赋值项目根目录，例如D:\www\blog

        $this->bindPathsInContainer();

        return $this;
    }

接着执行$this->bindPathsInContainer();

/**
     * Bind all of the application paths in the container.
     *
     * @return void
     */
    protected function bindPathsInContainer()
    {
        $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());
    }

这里$this->path();，也就是返回了app目录,例如D:\www\blog\app

/**
     * Get the path to the application "app" directory.
     *
     * @param  string  $path
     * @return string
     */
    public function path($path = '')
    {
        $appPath = $this->appPath ?: $this->basePath.DIRECTORY_SEPARATOR.'app';

        return $appPath.($path ? DIRECTORY_SEPARATOR.$path : $path);
    }

其他路径也类似，例如configPath();

public function configPath($path = '')
    {
        return $this->basePath.DIRECTORY_SEPARATOR.'config'.($path ? DIRECTORY_SEPARATOR.$path : $path);
    }

接着看$this->instance('path', $this->path())方法，这里走到了container类中去了，因为Application类是继承了container类的

/**
     * Register an existing instance as shared in the container.
     *
     * @param  string  $abstract
     * @param  mixed  $instance
     * @return mixed
     */
    public function instance($abstract, $instance)
    {
        $this->removeAbstractAlias($abstract);

        $isBound = $this->bound($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 ($isBound) {
            $this->rebound($abstract);
        }

        return $instance;
    }

接着走到$this->removeAbstractAlias($abstract);方法，传入的是'path'，这里主要是从Application实例的aliases变量中清除缓存，通过代码很容易看出，不存在就直接返回，存在就遍历数组从中清除掉

/**
     * Remove an alias from the contextual binding alias cache.
     *
     * @param  string  $searched
     * @return void
     */
    protected function removeAbstractAlias($searched)
    {
        if (! isset($this->aliases[$searched])) {
            return;
        }

        foreach ($this->abstractAliases as $abstract => $aliases) {
            foreach ($aliases as $index => $alias) {
                if ($alias == $searched) {
                    unset($this->abstractAliases[$abstract][$index]);
                }
            }
        }
    }

那么后面的configPath()也都一样，清除缓存

总结，第一个方法的作用是设置项目根目录和清除$alias中的缓存

if ($basePath) {
            $this->setBasePath($basePath);
        }

所以回到了Application的构造方法里继续向下执行$this->registerBaseBindings();方法，根据翻译大概知道是注册绑定一个基础的容器

/**
     * Register the basic bindings into the container.
     *
     * @return void
     */
    protected function registerBaseBindings()
    {
        static::setInstance($this);

        $this->instance('app', $this);

        $this->instance(Container::class, $this);
        $this->singleton(Mix::class);

        $this->singleton(PackageManifest::class, function () {
            return new PackageManifest(
                new Filesystem, $this->basePath(), $this->getCachedPackagesPath()
            );
        });
    }

执行static::setInstance($this);，这里把$this赋给了$instance

/**
     * Set the shared instance of the container.
     *
     * @param  \Illuminate\Contracts\Container\Container|null  $container
     * @return \Illuminate\Contracts\Container\Container|static
     */
    public static function setInstance(ContainerContract $container = null)
    {
        return static::$instance = $container;
    }

然后$this->instance('app', $this);

/**
     * Register an existing instance as shared in the container.
     *
     * @param  string  $abstract
     * @param  mixed  $instance
     * @return mixed
     */
    public function instance($abstract, $instance)
    {
        $this->removeAbstractAlias($abstract);

        $isBound = $this->bound($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 ($isBound) {
            $this->rebound($abstract);
        }

        return $instance;
    }

然后$this->removeAbstractAlias($abstract);上面说过，是清除$this->alias['app']的缓存

然后$isBound = $this->bound($abstract);，判断$bindings，instances，alias中是否存在'app'这个键值，存在则为true，所以第一次运行这里为false

/**
     * Determine if the given abstract type has been bound.
     *
     * @param  string  $abstract
     * @return bool
     */
    public function bound($abstract)
    {
        return isset($this->bindings[$abstract]) ||
               isset($this->instances[$abstract]) ||
               $this->isAlias($abstract);
    }

/**
     * Determine if a given string is an alias.
     *
     * @param  string  $name
     * @return bool
     */
    public function isAlias($name)
    {
        return isset($this->aliases[$name]);
    }

接着unset($this->aliases[$abstract]);，从aliases中unset掉'app'

然后$this->instances[$abstract] = $instance;，把$this赋给instance['app']

if ($isBound) {
            $this->rebound($abstract);
        }

当然这里由于是false不执行，但还是看一下$this->rebound($abstract);

/**
     * Fire the "rebound" callbacks for the given abstract type.
     *
     * @param  string  $abstract
     * @return void
     */
    protected function rebound($abstract)
    {
        $instance = $this->make($abstract);

        foreach ($this->getReboundCallbacks($abstract) as $callback) {
            call_user_func($callback, $this, $instance);
        }
    }

这里$instance = $this->make($abstract);，记住传入的是'app'

/**
     * Resolve the given type from the container.
     *
     * @param  string  $abstract
     * @param  array  $parameters
     * @return mixed
     *
     * @throws \Illuminate\Contracts\Container\BindingResolutionException
     */
    public function make($abstract, array $parameters = [])
    {
        return $this->resolve($abstract, $parameters);
    }

然后$this->resolve($abstract, $parameters);，传入了'app'和空数组，这段代码有点长

/**
     * Resolve the given type from the container.
     *
     * @param  string  $abstract
     * @param  array  $parameters
     * @param  bool  $raiseEvents
     * @return mixed
     *
     * @throws \Illuminate\Contracts\Container\BindingResolutionException
     */
    protected function resolve($abstract, $parameters = [], $raiseEvents = true)
    {
        $abstract = $this->getAlias($abstract);    //这里获取$this->alias['app']，为null，因为前面没有设置，而且unset掉了

        $concrete = $this->getContextualConcrete($abstract);

        $needsContextualBuild = ! empty($parameters) || ! is_null($concrete);

        // If an instance of the type is currently being managed as a singleton we'll
        // just return an existing instance instead of instantiating new instances
        // so the developer can keep using the same objects instance every time.
        if (isset($this->instances[$abstract]) && ! $needsContextualBuild) {
            return $this->instances[$abstract];
        }

        $this->with[] = $parameters;

        if (is_null($concrete)) {
            $concrete = $this->getConcrete($abstract);
        }

        // We're ready to instantiate an instance of the concrete type registered for
        // the binding. This will instantiate the types, as well as resolve any of
        // its "nested" dependencies recursively until all have gotten resolved.
        if ($this->isBuildable($concrete, $abstract)) {
            $object = $this->build($concrete);
        } else {
            $object = $this->make($concrete);
        }

        // If we defined any extenders for this type, we'll need to spin through them
        // and apply them to the object being built. This allows for the extension
        // of services, such as changing configuration or decorating the object.
        foreach ($this->getExtenders($abstract) as $extender) {
            $object = $extender($object, $this);
        }

        // If the requested type is registered as a singleton we'll want to cache off
        // the instances in "memory" so we can return it later without creating an
        // entirely new instance of an object on each subsequent request for it.
        if ($this->isShared($abstract) && ! $needsContextualBuild) {
            $this->instances[$abstract] = $object;
        }

        if ($raiseEvents) {
            $this->fireResolvingCallbacks($abstract, $object);
        }

        // Before returning, we will also set the resolved flag to "true" and pop off
        // the parameter overrides for this build. After those two things are done
        // we will be ready to return back the fully constructed class instance.
        $this->resolved[$abstract] = true;

        array_pop($this->with);

        return $object;
    }

看下$this->getContextualConcrete($abstract);方法

/**
     * Get the contextual concrete binding for the given abstract.
     *
     * @param  string  $abstract
     * @return \Closure|string|array|null
     */
    protected function getContextualConcrete($abstract)
    {
        if (! is_null($binding = $this->findInContextualBindings($abstract))) {
            return $binding;
        }

        // Next we need to see if a contextual binding might be bound under an alias of the
        // given abstract type. So, we will need to check if any aliases exist with this
        // type and then spin through them and check for contextual bindings on these.
        if (empty($this->abstractAliases[$abstract])) {
            return;
        }

        foreach ($this->abstractAliases[$abstract] as $alias) {
            if (! is_null($binding = $this->findInContextualBindings($alias))) {
                return $binding;
            }
        }
    }

再接着$this->findInContextualBindings($abstract)方法，传入的也是'app'，返回的是一个contextual数组里的值，起初没有设置，那么这里返回null

/**
     * Find the concrete binding for the given abstract in the contextual binding array.
     *
     * @param  string  $abstract
     * @return \Closure|string|null
     */
    protected function findInContextualBindings($abstract)
    {
        return $this->contextual[end($this->buildStack)][$abstract] ?? null;
    }

那么$needsContextualBuild = ! empty($parameters) || ! is_null($concrete);这里就是true，也就是需要构建这个啥数组值

所以后面直接返回了$this->instances[$abstract]，后面就先不看了

接着回到Application中的registerBaseBindings()中的$this->instance(Container::class, $this);方法，把Container::class类添加到$instance,

这就是$this->instances[Container::class] 和 $this->instances['app']都是this

接着$this->singleton(Mix::class);

/**
     * Register a shared binding in the container.
     *
     * @param  string  $abstract
     * @param  \Closure|string|null  $concrete
     * @return void
     */
    public function singleton($abstract, $concrete = null)
    {
        $this->bind($abstract, $concrete, true);
    }

/**
     * Register a binding with the container.
     *
     * @param  string  $abstract
     * @param  \Closure|string|null  $concrete
     * @param  bool  $shared
     * @return void
     */
    public function bind($abstract, $concrete = null, $shared = false)
    {
        $this->dropStaleInstances($abstract);

        // If no concrete type was given, we will simply set the concrete type to the
        // abstract type. After that, the concrete type to be registered as shared
        // without being forced to state their classes in both of the parameters.
        if (is_null($concrete)) {
            $concrete = $abstract;
        }

        // 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 (! $concrete instanceof Closure) {
            if (! is_string($concrete)) {
                throw new \TypeError(self::class.'::bind(): Argument #2 ($concrete) must be of type Closure|string|null');
            }

            $concrete = $this->getClosure($abstract, $concrete);
        }

        $this->bindings[$abstract] = compact('concrete', 'shared');

        // If the abstract type was already resolved in this container we'll fire the
        // rebound listener so that any objects which have already gotten resolved
        // can have their copy of the object updated via the listener callbacks.
        if ($this->resolved($abstract)) {
            $this->rebound($abstract);
        }
    }

$this->dropStaleInstances($abstract);，传入了Mix::class，清除了数组中的键值

**
     * Drop all of the stale instances and aliases.
     *
     * @param  string  $abstract
     * @return void
     */
    protected function dropStaleInstances($abstract)
    {
        unset($this->instances[$abstract], $this->aliases[$abstract]);
    }

PHP Closure 类是用于代表匿名函数的类，匿名函数（在 PHP 5.3 中被引入）会产生这个类型的对象，Closure类摘要如下：Closure解释

Closure {
    __construct ( void )
    public static Closure bind (Closure $closure , object $newthis [, mixed $newscope = 'static' ])
    public Closure bindTo (object $newthis [, mixed $newscope = 'static' ])
}

方法说明：
Closure::__construct — 用于禁止实例化的构造函数
Closure::bind — 复制一个闭包，绑定指定的$this对象和类作用域。
Closure::bindTo — 复制当前闭包对象，绑定指定的$this对象和类作用域。

除了此处列出的方法，还有一个 __invoke 方法。这是为了与其他实现了 __invoke()魔术方法 的对象保持一致性，但调用闭包对象的过程与它无关。

然后执行了这里$concrete = $this->getClosure($abstract, $concrete);，传入了两个Mix::class

/**
     * Get the Closure to be used when building a type.
     *
     * @param  string  $abstract
     * @param  string  $concrete
     * @return \Closure
     */
    protected function getClosure($abstract, $concrete)
    {
        return function ($container, $parameters = []) use ($abstract, $concrete) {
            if ($abstract == $concrete) {
                return $container->build($concrete);
            }

            return $container->resolve(
                $concrete, $parameters, $raiseEvents = false
            );
        };
    }

执行了$container->build($concrete);

/**
     * Instantiate a concrete instance of the given type.
     *
     * @param  \Closure|string  $concrete
     * @return mixed
     *
     * @throws \Illuminate\Contracts\Container\BindingResolutionException
     */
    public function build($concrete)
    {
        // If the concrete type is actually a Closure, we will just execute it and
        // hand back the results of the functions, which allows functions to be
        // used as resolvers for more fine-tuned resolution of these objects.
        if ($concrete instanceof Closure) {
            return $concrete($this, $this->getLastParameterOverride());
        }

        try {
            $reflector = new ReflectionClass($concrete);    //实例化了一个反射类
        } catch (ReflectionException $e) {
            throw new BindingResolutionException("Target class [$concrete] does not exist.", 0, $e);
        }

        // If the type is not instantiable, the developer is attempting to resolve
        // an abstract type such as an Interface or Abstract Class and there is
        // no binding registered for the abstractions so we need to bail out.
        if (! $reflector->isInstantiable()) {    //判断类是否可用实例化
            return $this->notInstantiable($concrete);//抛出异常
        }

        $this->buildStack[] = $concrete;

        $constructor = $reflector->getConstructor();//获取构造器方法

        // If there are no constructors, that means there are no dependencies then
        // we can just resolve the instances of the objects right away, without
        // resolving any other types or dependencies out of these containers.
        if (is_null($constructor)) {
            array_pop($this->buildStack);

            return new $concrete;//没有构造方法就直接new
        }

        $dependencies = $constructor->getParameters();//获取构造方法的参数

        // Once we have all the constructor's parameters we can create each of the
        // dependency instances and then use the reflection instances to make a
        // new instance of this class, injecting the created dependencies in.
        try {
            $instances = $this->resolveDependencies($dependencies);
        } catch (BindingResolutionException $e) {
            array_pop($this->buildStack);

            throw $e;
        }

        array_pop($this->buildStack);

        return $reflector->newInstanceArgs($instances);
    }

/**
     * Get the last parameter override.
     *
     * @return array
     */
    protected function getLastParameterOverride()
    {
        return count($this->with) ? end($this->with) : [];    //获取最后一个值
    }

抛出类不可以实例化的异常

/**
     * Throw an exception that the concrete is not instantiable.
     *
     * @param  string  $concrete
     * @return void
     *
     * @throws \Illuminate\Contracts\Container\BindingResolutionException
     */
    protected function notInstantiable($concrete)
    {
        if (! empty($this->buildStack)) {
            $previous = implode(', ', $this->buildStack);

            $message = "Target [$concrete] is not instantiable while building [$previous].";
        } else {
            $message = "Target [$concrete] is not instantiable.";
        }

        throw new BindingResolutionException($message);
    }

获取构造器方法$constructor = $reflector->getConstructor();，以及获取参数$constructor->getParameters();

接着$instances = $this->resolveDependencies($dependencies);这里获取类的参数，以及类型是self，parent等等，解析类

protected function resolveDependencies(array $dependencies)
    {
        $results = [];

        foreach ($dependencies as $dependency) {
            // If the dependency has an override for this particular build we will use
            // that instead as the value. Otherwise, we will continue with this run
            // of resolutions and let reflection attempt to determine the result.
            if ($this->hasParameterOverride($dependency)) {
                $results[] = $this->getParameterOverride($dependency);

                continue;
            }

            // If the class is null, it means the dependency is a string or some other
            // primitive type which we can not resolve since it is not a class and
            // we will just bomb out with an error since we have no-where to go.
            $result = is_null(Util::getParameterClassName($dependency))
                            ? $this->resolvePrimitive($dependency)
                            : $this->resolveClass($dependency);

            if ($dependency->isVariadic()) {
                $results = array_merge($results, $result);
            } else {
                $results[] = $result;
            }
        }

        return $results;
    }

/**
     * Get the class name of the given parameter's type, if possible.
     *
     * From Reflector::getParameterClassName() in Illuminate\Support.
     *
     * @param  \ReflectionParameter  $parameter
     * @return string|null
     */
    public static function getParameterClassName($parameter)
    {
        $type = $parameter->getType();

        if (! $type instanceof ReflectionNamedType || $type->isBuiltin()) {
            return;
        }

        $name = $type->getName();

        if (! is_null($class = $parameter->getDeclaringClass())) {
            if ($name === 'self') {
                return $class->getName();
            }

            if ($name === 'parent' && $parent = $class->getParentClass()) {
                return $parent->getName();
            }
        }

        return $name;
    }

由于我对方法的使用不熟，方法和返回都不太清楚，这里就当是直接实例化对象这样理解return $reflector->newInstanceArgs($instances);

然后$this->bindings[$abstract] = compact('concrete', 'shared');，把返回的实例化对象放到了bindings数组中，也就是Mix类的实例

接着$this->rebound($abstract);，上面讲过，后面把$abstract对应的类实例放到了$instance数组中了

if ($this->resolved($abstract)) {
            $this->rebound($abstract);
        }

再接着把PackageManifest类实例放进$instance中

$this->singleton(PackageManifest::class, function () {
            return new PackageManifest(
                new Filesystem, $this->basePath(), $this->getCachedPackagesPath()
            );
        });

再回到Application类构造方法中的$this->registerBaseServiceProviders();，注册基础服务

/**
     * 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));
    }

再接着$this->registerCoreContainerAliases();，绑定基础的对象实例

回到app.php，接着又绑定了三个对象实例，分别用来处理相应的请求以及异常

$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
);

再回到index.php中，$kernel = $app->make(Illuminate\Contracts\Http\Kernel::class);，这里传入的是interface，实际绑定的类是Illuminate\Foundation\Http\Kernel

核心就在laravel\framework\src\Illuminate\Foundation\Http\Kernel.php，该类实现了Illuminate\Contracts\Http\Kernel接口

/**
     * Resolve the given type from the container.
     *
     * @param  string  $abstract
     * @param  array  $parameters
     * @return mixed
     */
    public function make($abstract, array $parameters = [])
    {
        $this->loadDeferredProviderIfNeeded($abstract = $this->getAlias($abstract));

        return parent::make($abstract, $parameters);
    }

延迟加载$this->loadDeferredProviderIfNeeded($abstract = $this->getAlias($abstract));

再接着parent::make($abstract, $parameters);，把Illuminate\Foundation\Http\Kernel类实例绑定到容器中

然后index.php中

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

这里$request = Illuminate\Http\Request::capture()，作为传入参数

/**
     * Create a new Illuminate HTTP request from server variables.
     *
     * @return static
     */
    public static function capture()
    {
        static::enableHttpMethodParameterOverride();

        return static::createFromBase(SymfonyRequest::createFromGlobals());
    }

public static function enableHttpMethodParameterOverride()
    {
        self::$httpMethodParameterOverride = true;
    }

然后SymfonyRequest::createFromGlobals()，获取请求信息

/**
     * Creates a new request with values from PHP's super globals.
     *
     * @return static
     */
    public static function createFromGlobals()
    {
        $request = self::createRequestFromFactory($_GET, $_POST, [], $_COOKIE, $_FILES, $_SERVER);

        if ($_POST) {
            $request->request = new InputBag($_POST);
        } elseif (0 === strpos($request->headers->get('CONTENT_TYPE'), 'application/x-www-form-urlencoded')
            && \in_array(strtoupper($request->server->get('REQUEST_METHOD', 'GET')), ['PUT', 'DELETE', 'PATCH'])
        ) {
            parse_str($request->getContent(), $data);
            $request->request = new InputBag($data);
        }

        return $request;
    }

然后static::createFromBase(SymfonyRequest::createFromGlobals());，框架封装请求信息

/**
     * Create an Illuminate request from a Symfony instance.
     *
     * @param  \Symfony\Component\HttpFoundation\Request  $request
     * @return static
     */
    public static function createFromBase(SymfonyRequest $request)
    {
        $newRequest = (new static)->duplicate(
            $request->query->all(), $request->request->all(), $request->attributes->all(),
            $request->cookies->all(), $request->files->all(), $request->server->all()
        );

        $newRequest->headers->replace($request->headers->all());

        $newRequest->content = $request->content;

        $newRequest->request = $newRequest->getInputSource();

        return $newRequest;
    }

这里调用了handle方法

/**
     * Handle an incoming HTTP request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function handle($request)
    {
        try {
            $request->enableHttpMethodParameterOverride();

            $response = $this->sendRequestThroughRouter($request);
        } catch (Throwable $e) {
            $this->reportException($e);

            $response = $this->renderException($request, $e);
        }

        $this->app['events']->dispatch(
            new RequestHandled($request, $response)
        );

        return $response;
    }

再接着$response = $this->sendRequestThroughRouter($request);

/**
     * Send the given request through the middleware / router.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    protected function sendRequestThroughRouter($request)
    {
        $this->app->instance('request', $request);

        Facade::clearResolvedInstance('request');

        $this->bootstrap();

        return (new Pipeline($this->app))
                    ->send($request)
                    ->through($this->app->shouldSkipMiddleware() ? [] : $this->middleware)
                    ->then($this->dispatchToRouter());
    }

这里调用$this->bootstrap();

/**
     * Bootstrap the application for HTTP requests.
     *
     * @return void
     */
    public function bootstrap()
    {
        if (! $this->app->hasBeenBootstrapped()) {
            $this->app->bootstrapWith($this->bootstrappers());
        }
    }

然后调用$this->app->bootstrapWith($this->bootstrappers());，将基础服务类都绑定到容器中了

$this->bootstrappers()

/**
     * Get the bootstrap classes for the application.
     *
     * @return array
     */
    protected function bootstrappers()
    {
        return $this->bootstrappers;
    }

protected $bootstrappers = [
        \Illuminate\Foundation\Bootstrap\LoadEnvironmentVariables::class,
        \Illuminate\Foundation\Bootstrap\LoadConfiguration::class,
        \Illuminate\Foundation\Bootstrap\HandleExceptions::class,
        \Illuminate\Foundation\Bootstrap\RegisterFacades::class,
        \Illuminate\Foundation\Bootstrap\RegisterProviders::class,
        \Illuminate\Foundation\Bootstrap\BootProviders::class,
    ];

将上面的类实例全绑定到容器中了

/**
     * Run the given array of bootstrap classes.
     *
     * @param  string[]  $bootstrappers
     * @return void
     */
    public function bootstrapWith(array $bootstrappers)
    {
        $this->hasBeenBootstrapped = true;

        foreach ($bootstrappers as $bootstrapper) {
            $this['events']->dispatch('bootstrapping: '.$bootstrapper, [$this]);

            $this->make($bootstrapper)->bootstrap($this);

            $this['events']->dispatch('bootstrapped: '.$bootstrapper, [$this]);
        }
    }

通过链式调用最终执行send()

/**
     * Set the object being sent through the pipeline.
     *
     * @param  mixed  $passable
     * @return $this
     */
    public function send($passable)
    {
        $this->passable = $passable;

        return $this;
    }

最后$kernel->terminate($request, $response);，里面有调用中间件，可以随时终止执行并响应

/**
     * Call the terminate method on any terminable middleware.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Illuminate\Http\Response  $response
     * @return void
     */
    public function terminate($request, $response)
    {
        $this->terminateMiddleware($request, $response);

        $this->app->terminate();
    }

/**
     * Terminate the application.
     *
     * @return void
     */
    public function terminate()
    {
        foreach ($this->terminatingCallbacks as $terminating) {
            $this->call($terminating);
        }
    }

以上就是简单地过了一下laravel8的index.php请求执行过程

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