Dropdown Field, Extended Return Values

gistfile1.php

Array
(
    [selected_value] => Dropdown 2
    [selected_option] => Array
        (
            [value] => Dropdown 2
            [key] => dropdown_num_3
            [is_selected] => 1
        )

    [options] => Array
        (
            [0] => Array
                (
                    [value] => Dropdown 1
                    [key] => dropdown_num_2
                    [is_selected] => 
                )

            [1] => Array
                (
                    [value] => Dropdown 2
                    [key] => dropdown_num_3
                    [is_selected] => 1
                )

            [2] => Array
                (
                    [value] => Dropdown 3
                    [key] => dropdown_num_4
                    [is_selected] => 
                )

        )

)

Can i use this code create custom field in wordpress?

Can i use this code create custom field in wordpress?

No, this is old example return values from a plugin that is no longer in development.