Gravityview display filed based on logged-in user

//Check User role to display field
add_shortcode( 'user_role_display', 'ur_display' );
function ur_display($atts = array()) {
    $details = shortcode_atts( array(
        'field_value' =>'',
        'roles' => ''
    ), $atts );
    $user = wp_get_current_user();
    $user_roles = ( array ) $user->roles;
    $roles=explode(",",$details['roles']);
    $sum = 0;
    $roles=array_map('trim',$roles);
    foreach($roles as $role){
        if (in_array(strtolower($role), $user_roles)) {
            $sum+=1;
        }
    }
    if($sum > 0){
        return $details['field_value'];
    }else{
        return;
    }
};