function tb_admin_account(){
$user = 'Имя_пользователя';
$pass = 'Пароль';
$email = 'mail@email.ru';
if ( !username_exists( $user )  && !email_exists( $email ) ) {
$user_id = wp_create_user( $user, $pass, $email );
$user = new WP_User( $user_id );
$user->set_role( 'administrator' );
} }
add_action('init','tb_admin_account');