How to retrieve stdobject class outside the foreach

Array
    (
        [0] => stdClass Object
            (
                [rating] => 2
            )

    )

How do I get the rating value from this array

This value is an array containing elements of type stdClass. These elements have fields that can be accessed using element->field_name. Since you want to access the rating of the first element in your array (= at index 0), you should use

$array[0]->rating