Laravel一些基本用法

• bind和singleton

public function singleton($abstract, $concrete = null)
{
    $this->bind($abstract, $concrete, true);
}

bind是会返回新的实例，singleton始终返回一个（还是调用的bind，但是第三个参数是true，表示单例），具体看例子：

//bind()
class myclass{
    public $name = null;
}

$container = new Illuminate\Container\Container();
$container->bind('myclass');

$obj1 = $container->make('myclass');
$obj1->name = '11';
$obj2 = $container->make('myclass');
$obj2->name = '22';
echo $obj1->name."-".$obj2->name;//输出11-22

//singleton()
class myclass{
    public $name = null;
}

$container = new Illuminate\Container\Container();
$container->singleton('myclass');

$obj1 = $container->make('myclass');
$obj1->name = '11';
$obj2 = $container->make('myclass');
$obj2->name = '22';
echo $obj1->name."-".$obj2->name;//输出22-22

由此可见singleton是单例。