Laravel 5.5) 加载过程instance方法

$app = new Illuminate\Foundation\Application(    realpath(__DIR__.'/../')
);

实例化 vendor/laravel/framework/src/Illuminate/Foundation/Application.php类 该类的魔术方法

    public function __construct($basePath = null)
    {        
        if ($basePath) {            $this->setbasePath($basePath);
        }        
        $this->registerbaseBindings();        
        $this->registerbaseServiceProviders();        
        $this->registerCoreContainerAliases();
    }

查看注册 app 和container到 instances数组中

    protected function registerbaseBindings()
    {        static::setInstance($this);        
        $this->instance('app', $this);        
        $this->instance(Container::class, $this);
    }

查看今天主要的方法 instance

流程图

 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);
        }
    }

第一个方法 removeAbstractAlias

    
    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]);
                }
            }
        }
    }

第二个方法: bound

    
    public function bound($abstract)
    {        return isset($this->bindings[$abstract]) ||               isset($this->instances[$abstract]) ||               $this->isAlias($abstract);
    }

第三个方法: rebound

 
    protected function rebound($abstract)
    {        
        $instance = $this->make($abstract);        
        foreach ($this->getReboundCallbacks($abstract) as $callback) {            call_user_func($callback, $this, $instance);
        }
    }

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