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Creating a resource in Zend_Acl is very simple. Zend_Acl provides the resource, Zend_Acl_Resource_Interface, to facilitate creating resources in an application. A class need only implement this interface, which consists of a single method, getResourceId(), for Zend_Acl to recognize the object as a resource. Additionally, Zend_Acl_Resource is provided by Zend_Acl as a basic resource implementation for developers to extend as needed.

Zend_Acl provides a tree structure to which multiple resources can be added. Since resources are stored in such a tree structure, they can be organized from the general (toward the tree root) to the specific (toward the tree leaves). Queries on a specific resource will automatically search the resource's hierarchy for rules assigned to ancestor resources, allowing for simple inheritance of rules. For example, if a default rule is to be applied to each building in a city, one would simply assign the rule to the city, instead of assigning the same rule to each building. Some buildings may require exceptions to such a rule, however, and this can be achieved in Zend_Acl by assigning such exception rules to each building that requires such an exception. A resource may inherit from only one parent resource, though this parent resource can have its own parent resource, etc.

Zend_Acl also supports privileges on resources (e.g., "create", "read", "update", "delete"), so the developer can assign rules that affect all privileges or specific privileges on one or more resources.

Zend Framework