class App { protected $routes = []; protected $responseStatus = '200 OK'; protected $responseContentType = 'text/html'; protected $responseBody = 'Laravel学院'; public function addRoute($routePath, $routeCallback) { $this->routes[$routePath] = $routeCallback->bindTo($this, __CLASS__); } public function dispatch($currentPath) { foreach ($this->routes as $routePath => $callback) { if( $routePath === $currentPath) { $callback(); } } header('HTTP/1.1 ' . $this->responseStatus); header('Content-Type: ' . $this->responseContentType); header('Content-Length: ' . mb_strlen($this->responseBody)); echo $this->responseBody; } }
这里我们需要重点关注addRoute方法,这个方法的参数分别是一个路由路径和一个路由回调,dispatch方法的参数是当前HTTP请求的路径,它会调用匹配的路由回调。第9行是重点所在,我们将路由回调绑定到了当前的App实例上。这么做能够在回调函数中处理App实例的状态:
$app = new App(); $app->addRoute(‘user/nonfu', function(){ $this->responseContentType = ‘application/json;charset=utf8'; $this->responseBody = ‘{“name”:”LaravelAcademy"}'; }); $app->dispatch(‘user/nonfu'); 在Larval底层也有用到bindTo方法,详见Illuminate\Support\Traits\Macroable的__call方法:
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