Dynamically create a new object from a class with different namespace

Question

I'm trying to create a small RESTful API for my database and I encountered a problem creating controller object dynamically based on user request, because all my code is using namespaces and just doing:

$api = new $controllerName($request);

Won't work. Because $controllerName would resolve to "ReadController", but is actually \controllers\lottery\ReadController hence the error

The whole part of defining the path to the class is:

if ($method === 'GET') {
    $controllerName = 'ReadController';
    // @NOTE: $category is a part of $_GET parameters, e.g: /api/lottery <- lottery is a $category
    $controllerFile = CONTROLLERS.$category.'/'.$controllerName.'.php';
    if (file_exists($controllerFile)) {
        include_once($controllerFile);

        $api = new $controllerName($request);
    } else {
        throw new \Exception('Undefined controller');
    }
}

And the declaration of ReadController in core\controllers\lottery\ReadController.php

namespace controllers\lottery;

class ReadController extends \core\API {

}

Any ideas how to dynamically create the object?

Thanks!

deceze · Accepted Answer · 2013-11-03 09:43:08Z

8

$controllerName = 'controllers\lottery\ReadController';
new $controllerName($request);

Classes instantiated from strings must always use the fully qualified class name.

answered Nov 3, 2013 at 9:43

deceze♦

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4 Comments

deb0rian Over a year ago

That simple... damn.. Thanks, it worked. Will accept the answer in 10min.

Alma Do Over a year ago

Yes, I had similar problem. The only improvement to answer is: why it is so. And it's so because PHP will replace namespace aliases to it's full path on interpretation, so aliases will not persist in opcodes and VM will know nothing of them

deceze Over a year ago

@Alma I think that's way too detailed an explanation. It's as simple as stackoverflow.com/a/16808358/476

Alma Do Over a year ago

Fair enought. I thought OP was asking about ReadController as an alias for \controllers\lottery\ReadController

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