framework/rbac/PhpManager.php
protected function saveRules()
    {
        $rules = [];
        foreach ($this->rules as $name => $rule) {
            $rules[$name] = serialize($rule);
        }
        $this->saveToFile($rules, $this->ruleFile);
    }
protected function saveRules()
    {
        $rules = [];
        foreach ($this->rules as $name => $rule) {
            $rules[$name] = serialize($rule);
        }
        $this->saveToFile($rules, $this->ruleFile);
    }
Saves rules data into persistent storage.