How can I create an associative array from a database object and json_encode as an object instead of an array?

I am new to PHP and developing an application using Yii. I have a database object where all I got are all table records. I wanted to create an associative array from this object and then encode that array in json_encode. However, my desired result, which is objects instead of an array, is not coming. can anyone help, plz?
My code:

$info = array();
$category = Category::find()->all();
foreach($category as $key => $value) {
    $info[]=  array(
         "name" =>$value->name,
         "value" =>$value->description  
    ) ;
} 
echo json_encode($info,JSON_FORCE_OBJECT);

      

        
        
        
      

    

Output :

{"0":{"name":"test","value":"A"},"1":{"name":"test 2","value":"B"}}  

      

        
        
        
      

    

Desired output :

{"category":[{"name":"test","value":"A"},{"name":"test 2","value":"B"}]}