本文实例讲述了Laravel框架用户登陆身份验证实现方法。分享给大家供大家参考，具体如下：
PHP;">
if ( !Auth::guest() )
{
return Redirect::to('/dashboard');
}
那Auth::guest是如何调用的呢？
laravel用了Facade模式，相关门面类在laravel/framework/src/Illuminate/Support/Facades文件夹定义的，看下Auth类的定义：
PHP;">
class Auth extends Facade {
/**
* Get the registered name of the component.
*
* @return string
*/
protected static function getFacadeAccessor() { return 'auth'; }
}
laravel框架中，Facade模式使用反射，相关方法其实调用方法，app['auth']是什么时候创建的呢，
AuthServiceProvider::register方法会注册：
app->bindShared('auth',function($app)
{
// Once the authentication service has actually been requested by the developer
// we will set a variable in the application indicating such. This helps us
// know that we need to set any queued cookies in the after event later.
$app['auth.loaded'] = true;
return new AuthManager($app);
});
那为什么最终会调到哪里呢，看下堆栈：
guest()
Illuminate\Support\Manager->__call
public function __call($method,$parameters)
{
return call_user_func_array(array($this->driver(),$method),$parameters);
}
看下driver的代码：
getDefaultDriver();
// If the given driver has not been created before,we will create the instances
// here and cache it so we can return it next time very quickly. If there is
// already a driver created by this name,we'll just return that instance.
if ( ! isset($this->drivers[$driver]))
{
$this->drivers[$driver] = $this->createDriver($driver);
}
return $this->drivers[$driver];
}
没有会调用方法
app['config']['auth.driver'];
}
'eloquent'
则调用的是
createEloquentProvider();
return new Guard($provider,$this->app['session.store']);
}
所以Auth::guest最终调用的是Guard::guest方法
这里的逻辑先从session中取用户信息，奇怪的是session里只保存的是用户ID，然后拿这个ID来从数据库中取用户信息
loggedOut) return;
// If we have already retrieved the user for the current request we can just
// return it back immediately. We do not want to pull the user data every
// request into the method because that would tremendously slow an app.
if ( ! is_null($this->user))
{
return $this->user;
}
$id = $this->session->get($this->getName());
// First we will try to load the user using the identifier in the session if
// one exists. Otherwise we will check for a "remember me" cookie in this
// request,and if one exists,attempt to retrieve the user using that.
$user = null;
if ( ! is_null($id))
{
//provider为EloquentUserProvider
$user = $this->provider->retrieveByID($id);
}
// If the user is null,but we decrypt a "recaller" cookie we can attempt to
// pull the user data on that cookie which serves as a remember cookie on
// the application. Once we have a user we can return it to the caller.
$recaller = $this->getRecaller();
if (is_null($user) && ! is_null($recaller))
{
$user = $this->getUserByRecaller($recaller);
}
return $this->user = $user;
}
更多关于Laravel相关内容感兴趣的读者可查看本站专题：《》、《》、《》、《》及《PHP常见数据库操作技巧汇总》
希望本文所述对大家基于Laravel框架的PHP程序设计有所帮助。
原文链接：https://www.f2er.com/laravel/16796.html