namespace AppBase;
class App
{
    protected $loader;

    public function __construct()
    {
        	$reflectionClass = new \ReflectionClass($this);
    	    $namespace = $reflectionClass->getNamespaceName(); //AppExample
    	    echo $namespace;
       /*Логика*/
    }
    
}
namespace AppBase;
class Loader {}
namespace AppExample;
class App extends \AppBase\App {}
namespace AppExample;
class Loader extends \AppBase\Loader {}

$app = new \AppExample\App();

foreach( $params as $key=>$value )
{
    if(is_numeric($value))
    {
        $criteria->compare($key,$value);
     }
}