singleton和bind都是返回一个类的实例,不同的是singleton是单例模式,而bind是每次返回一个新的实例。
1、singleton
1 2 3 4 5 6 7 8 9 10 | class fun { public $strKey;}app()->singleton('fun', fun::class);$fun1 = app()->make('fun');$fun2 = app()->make('fun');$fun1->strKey = "fun1";$fun2->strKey = "fun2";echo $fun1->strKey . ' ' . $fun2->strKey; |
最后获取到的结果是fun2 fun2
2、bind
1 2 3 4 5 6 7 8 9 10 | class fun { public $strKey;}app()->bind('fun', fun::class);$fun1 = app()->make('fun');$fun2 = app()->make('fun');$fun1->strKey = "fun1";$fun2->strKey = "fun2";echo $fun1->strKey . ' ' . $fun2->strKey; |
最后获取到的结果是fun1 fun2
再看框架底层代码:
1 2 3 4 | public function singleton($abstract, $concrete = null){ $this->bind($abstract, $concrete, true);} |
发现singleton方法其实也是调用bind方法,只是最后一个参数是true,表示单例模式。框架源代码:Illuminate/Container/Container.php