framework/rbac/DbManager.php
public function getChildRoles($roleName)
    {
        $role = $this->getRole($roleName);

        if ($role === null) {
            throw new InvalidArgumentException("Role \"$roleName\" not found.");
        }

        $result = [];
        $this->getChildrenRecursive($roleName, $this->getChildrenList(), $result);

        $roles = [$roleName => $role];

        $roles += array_filter($this->getRoles(), function (Role $roleItem) use ($result) {
            return array_key_exists($roleItem->name, $result);
        });

        return $roles;
    }
public function getChildRoles($roleName)
    {
        $role = $this->getRole($roleName);

        if ($role === null) {
            throw new InvalidArgumentException("Role \"$roleName\" not found.");
        }

        $result = [];
        $this->getChildrenRecursive($roleName, $this->getChildrenList(), $result);

        $roles = [$roleName => $role];

        $roles += array_filter($this->getRoles(), function (Role $roleItem) use ($result) {
            return array_key_exists($roleItem->name, $result);
        });

        return $roles;
    }
{@inheritdoc}