在php mvc中路由api REST

I want create mvc structure using routing i do something like this
$router->add('/',['controller'=> 'home', 'action'=>'index']);
$router->add('{controller}/{action}'); // general case $router->add('admin/{controller}/{action}',['namespace' => 'admin');
So urls:
Site/ Site/home/index
Site/admin/users/all
Site/controller/action

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This works with web pages but the problem how to add routes for API RESTfull ? I try something like this $router->add('api/{controller}',['namespace'=>'api']); Without seting action because its bad practice to add the verb in url like this site/api/users/getAll Its must be like this Site/api/users
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So how i can do this with my router ? Any help ?