Laravel 5.5) Loading process instance method

In bootstrap/app.php

/**
 * 对于其中的instance register singleton 方法到时候单独拎出来说明
 * 
 * 1.设置基础路径
 * 2.使用instance 方法 绑定app 和Illuminate\Foundation\Application类的关系
 * 3.使用instance 方法 绑定Container 和Illuminate\Foundation\Application类的关系
 * 4.app变量中注册事件服务EventServiceProvider
 * 5.app变量中注册日志服务LogServiceProvider
 * 6.app变量中注册路由服务RoutingServiceProvider
 * 7.别名的注册（vendor/laravel/framework/src/Illuminate/Foundation/Application.php文件中的 registerCoreContainerAliases 方法） */$app = new Illuminate\Foundation\Application(    realpath(__DIR__.'/../')
);

Instantiate the vendor/laravel/framework/src/Illuminate/Foundation/Application.php class The magic of this class Method

    public function __construct($basePath = null)
    {        /**
         * 如果有传地址  设置基础路径 设置 
         * path                 $this->path()
         * path.base              $this->basePath()
         * path.lang             $this->langPath()
         * path.config             $this->configPath()
         * path.public            $this->publicPath()
         * path.storage            $this->storagePath()
         * path.database        $this->databasePath()
         * path.resources        $this->resourcePath()
         * path.bootstrap         $this->bootstrapPath()         */
        if ($basePath) {            $this->setBasePath($basePath);
        }        /**
         * 注册 app 和container到 instances数组中         */
        $this->registerBaseBindings();        /**
         * 注册EventServiceProvider LogServiceProvider  RoutingServiceProvider         */
        $this->registerBaseServiceProviders();        /**
         * 设置核心类的别名         */
        $this->registerCoreContainerAliases();
    }

View the registered app and container into the instances array

    protected function registerBaseBindings()
    {        static::setInstance($this);        /**
         * 由于初始化中  app没有添加到instances数组中 所以 不会执行build函数  只做了 instances数组中记录了app和$this         */
        $this->instance('app', $this);        /**
         * 由于初始化中  Container没有添加到instances数组中 所以 不会执行build函数 只做了 instances数组中记录了app和$this         */
        $this->instance(Container::class, $this);
    }

---

View today’s main methods instance

Flowchart

 public function instance($abstract, $instance)
    {        /**
         * 如果aliases 数组总存在  则游离abstractAliases 数组  删除其中的存在的值         */
        $this->removeAbstractAlias($abstract);        /**
         * 判断  在bindings aliases instances其中有一个存现  则返回true         */
        $isBound = $this->bound($abstract);        /**
         * 删除别名数组中对于的建         */
        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.
        /**
         * 在instances 数组中添加对于的建         */
        $this->instances[$abstract] = $instance;        /**
         * 如果之前存在实例化 则运行         */
        if ($isBound) {            $this->rebound($abstract);
        }
    }

The first method removeAbstractAlias

    /**
     * Remove an alias from the contextual binding alias cache.
     *
     * @param  string  $searched
     * @return void     */
    protected function removeAbstractAlias($searched)
    {        /**
         * 如果在别名数组中不存在则直接返回         */
        if (! isset($this->aliases[$searched])) {            return;
        }        /**
         * 游离抽象别名 吧存在抽象类别名数组中的存在的删除
         * @example abstractAliases = ['nameabstract'=>['aliase1','aliases2']]         */
        foreach ($this->abstractAliases as $abstract => $aliases) {            foreach ($aliases as $index => $alias) {                if ($alias == $searched) {                    unset($this->abstractAliases[$abstract][$index]);
                }
            }
        }
    }

The second method Method: bound

    /**
     * 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);
    }

The third method: bound

 /**
     * Fire the "rebound" callbacks for the given abstract type.
     *
     * @param  string  $abstract
     * @return void     */
    protected function rebound($abstract)
    {        /**
         * 主要实现的功能为 build 方法 实例化制定的类 并且返回该类 
         */
        $instance = $this->make($abstract);        /**
         * 查看reboundCallbacks 数组中是否存在该别名创建完成之后需要调用的方法数组 
         * 存在返回需要调用的方法数组   并且逐个执行         */
        foreach ($this->getReboundCallbacks($abstract) as $callback) {            call_user_func($callback, $this, $instance);
        }
    }

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