yii\rbac\PhpManager::removeRule PHP Method

    protected function removeRule($rule)
    {
        if (isset($this->rules[$rule->name])) {
            unset($this->rules[$rule->name]);
            foreach ($this->items as $item) {
                if ($item->ruleName === $rule->name) {
                    $item->ruleName = null;
                }
            }
            $this->saveRules();
            return true;
        } else {
            return false;
        }
    }