Load Dynamic Model

finally i found a solution for this problem
we have to must declare the full namespace path of a class

Code:

namespace App\Models
use App\Models\MyModel
...
case 1 :
$mymodule = new MyModel(); // work fine

case 2 :
$module = "MyModel";
$mymodule = new $module();  // Error not found

case 3:
$module = "App\\Models\\MyModel";
$mymodule = new $module();              // work fine

for help 
 
thx

if you are in controller then you need something like this
$m="\App\Models".'\\'.$j['model'];               
$model=new $m();