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Yaf_Route_Map::__construct is a constructor method in the Yaf PHP framework. It is used to initialize and create an instance of the Yaf_Route_Map class, which is responsible for mapping URLs to controllers and actions in the MVC architecture.

In simpler terms, this constructor method is used to set up the routing mechanism in Yaf, allowing the framework to determine which controller and action should handle a specific URL request.

Here is an example of how you can use Yaf_Route_Map::__construct:

php
$routeMap = new Yaf_Route_Map(array(
'/user/:id' => array(
'controller' => 'UserController',
'action' => 'show',
),
));


In this example, we create a new instance of Yaf_Route_Map and pass an array as the constructor parameter. The array contains a route pattern ("/user/:id") and its corresponding controller ("UserController") and action ("show"). The route pattern uses a colon prefix to indicate a placeholder that can match any value.

This route map can be used by the Yaf framework to handle URLs like "/user/123", where "123" would be passed as the "id" parameter to the "show" action of the "UserController".

Please note that this is just a basic example, and there are more advanced features and options available when working with Yaf_Route_Map.