Introduction

zend-permissions-rbac provides a lightweight Role-Based Access Control (RBAC) implementation in PHP. RBAC differs from access control lists (ACL) by putting the emphasis on roles and their permissions rather than objects (resources).

For the purposes of this documentation:

• an identity has one or more roles.
• a role requests access to a permission.
• a permission is given to a role.

Thus, RBAC has the following model:

• many to many relationship between identities and roles.
• many to many relationship between roles and permissions.
• roles can have parent and child roles (hierarchy of roles).

Roles

To create a role, extend the abstract class Zend\Permission\Rbac\AbstractRole or use the default role class, Zend\Permission\Rbac\Role. You can instantiate a role and add it to the RBAC container or add a role directly using the RBAC container addRole() method.

Permissions

Each role can have zero or more permissions and can be set directly to the role or by first retrieving the role from the RBAC container. Any parent role will inherit the permissions of their children.

Dynamic Assertions

In certain situations simply checking a permission key for access may not be enough. For example, assume two users, Foo and Bar, both have article.edit permission. What's to stop Bar from editing Foo's articles? The answer is dynamic assertions which allow you to specify extra runtime credentials that must pass for access to be granted.