场景

最近待业，重新翻看laravel源码, Route::get注册路由，那Route类并没有get方法，那这行代码究竟执行了什么呢?

总结

Route::get 会调到父类的魔术方法__callStatic

第一步: getFacadeRoot 从容器中获取名称是router的实例
第二步: 调用router实例的get方法， 入参是$args

源码分析

class Route extends Facade
{/*** Get the registered name of the component.** @return string*/protected static function getFacadeAccessor(){return 'router';}
}abstract class Facade
{/*** The application instance being facaded.** @var \Illuminate\Contracts\Foundation\Application*/protected static $app;/*** The resolved object instances.** @var array*/protected static $resolvedInstance;/*** Run a Closure when the facade has been resolved.** @param  \Closure  $callback* @return void*/public static function resolved(Closure $callback){$accessor = static::getFacadeAccessor();if (static::$app->resolved($accessor) === true) {$callback(static::getFacadeRoot());}static::$app->afterResolving($accessor, function ($service) use ($callback) {$callback($service);});}/*** Convert the facade into a Mockery spy.** @return \Mockery\MockInterface*/public static function spy(){if (! static::isMock()) {$class = static::getMockableClass();return tap($class ? Mockery::spy($class) : Mockery::spy(), function ($spy) {static::swap($spy);});}}/*** Initiate a partial mock on the facade.** @return \Mockery\MockInterface*/public static function partialMock(){$name = static::getFacadeAccessor();$mock = static::isMock()? static::$resolvedInstance[$name]: static::createFreshMockInstance();return $mock->makePartial();}/*** Initiate a mock expectation on the facade.** @return \Mockery\Expectation*/public static function shouldReceive(){$name = static::getFacadeAccessor();$mock = static::isMock()? static::$resolvedInstance[$name]: static::createFreshMockInstance();return $mock->shouldReceive(...func_get_args());}/*** Create a fresh mock instance for the given class.** @return \Mockery\MockInterface*/protected static function createFreshMockInstance(){return tap(static::createMock(), function ($mock) {static::swap($mock);$mock->shouldAllowMockingProtectedMethods();});}/*** Create a fresh mock instance for the given class.** @return \Mockery\MockInterface*/protected static function createMock(){$class = static::getMockableClass();return $class ? Mockery::mock($class) : Mockery::mock();}/*** Determines whether a mock is set as the instance of the facade.** @return bool*/protected static function isMock(){$name = static::getFacadeAccessor();return isset(static::$resolvedInstance[$name]) &&static::$resolvedInstance[$name] instanceof LegacyMockInterface;}/*** Get the mockable class for the bound instance.** @return string|null*/protected static function getMockableClass(){if ($root = static::getFacadeRoot()) {return get_class($root);}}/*** Hotswap the underlying instance behind the facade.** @param  mixed  $instance* @return void*/public static function swap($instance){static::$resolvedInstance[static::getFacadeAccessor()] = $instance;if (isset(static::$app)) {static::$app->instance(static::getFacadeAccessor(), $instance);}}/*** Get the root object behind the facade.** @return mixed*/public static function getFacadeRoot(){return static::resolveFacadeInstance(static::getFacadeAccessor());}/*** Get the registered name of the component.** @return string** @throws \RuntimeException*/protected static function getFacadeAccessor(){throw new RuntimeException('Facade does not implement getFacadeAccessor method.');}/*** Resolve the facade root instance from the container.** @param  object|string  $name* @return mixed*/protected static function resolveFacadeInstance($name){if (is_object($name)) {return $name;}if (isset(static::$resolvedInstance[$name])) {return static::$resolvedInstance[$name];}if (static::$app) {return static::$resolvedInstance[$name] = static::$app[$name];}}/*** Clear a resolved facade instance.** @param  string  $name* @return void*/public static function clearResolvedInstance($name){unset(static::$resolvedInstance[$name]);}/*** Clear all of the resolved instances.** @return void*/public static function clearResolvedInstances(){static::$resolvedInstance = [];}/*** Get the application instance behind the facade.** @return \Illuminate\Contracts\Foundation\Application*/public static function getFacadeApplication(){return static::$app;}/*** Set the application instance.** @param  \Illuminate\Contracts\Foundation\Application  $app* @return void*/public static function setFacadeApplication($app){static::$app = $app;}/*** Handle dynamic, static calls to the object.** @param  string  $method* @param  array  $args* @return mixed** @throws \RuntimeException*/public static function __callStatic($method, $args){$instance = static::getFacadeRoot();if (! $instance) {throw new RuntimeException('A facade root has not been set.');}return $instance->$method(...$args);}
}