php - How to fill the array values with the key values?

I have a form with 2 elements:

• checkboxes to select roles among a list
• a radio button to reverse the conditions

Depending if the radio button is opt-in, I am getting the roles array, that will be used to generate some sql:

$user_roles = array_filter($config->get('purge_users_roles')); 
if($config->get('reverse_role_purge_condition') == 1){
    $user_roles = array_filter($config->get('purge_users_roles'), function($x) {
        return $x === 0;
    });
    foreach ($user_roles as $key => $value){
        $user_roles[$key]=$key;
        var_dump($user_roles);     
    } 
}
Copy code

I'm usingvar_dump to display the unselected values:

array (size=2) 'membre_du_site' => int 0 'admin_site' => int 0

when in the other case, that would be somthg like :

array (size=2) 'membre_du_site' => 'membre_du_site' 'admin_site' => 'admin_site'

What is the best way to fill all array values with the corresponding key values, to get the same array structure in both cases?

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