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                [PHP-Casbin](https://github.com/php-casbin/php-casbin) 是一個強大的、高效的開源訪問控制框架,它支持基于各種訪問控制模型的權限管理。 `ABAC`是`基于屬性的訪問控制`,可以使用主體、客體或動作的屬性,而不是字符串本身來控制訪問。 ABAC的官方實例如下: ``` [request_definition] r = sub, obj, act [policy_definition] p = sub, obj, act [policy_effect] e = some(where (p.eft == allow)) [matchers] m = r.sub == r.obj.owner ``` 這是`r.obj`類的定義: ```php $data1 = new \stdClass(); $data1->name = 'data1'; $data1->owner = 'alice'; $data2 = new \stdClass(); $data2->name = 'data2'; $data2->owner = 'bob'; ``` 然后使用決策器進行決策: ```php $e->enforce('alice', $data1, 'read'); // true $e->enforce('alice', $data2, 'read'); // false $e->enforce('bob', $data1, 'read'); // false $e->enforce('bob', $data2, 'read'); // true ```
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