Index: tests/Zend/Acl/AclTest.php
===================================================================
--- tests/Zend/Acl/AclTest.php	(révision 18530)
+++ tests/Zend/Acl/AclTest.php	(copie de travail)
@@ -692,6 +692,28 @@
     }
 
     /**
+     * Ensures ability to query Zend_Acl against multiple role at once for given
+     * privilege(s) on given ressource
+     *
+     * @return void
+     */
+    public function testMultipleRolesPrivileges()
+    {
+        $this->_acl->addRole(new Zend_Acl_Role('admin'))
+             ->allow('admin',null,array('read','write'));
+        $this->_acl->addRole(new Zend_Acl_Role('staff'))
+             ->allow('staff',null,'read');
+
+        $this->assertTrue($this->_acl->isAllowed('admin', null, 'write'));
+        $this->assertFalse($this->_acl->isAllowed('staff', null, 'write'));
+        $this->assertTrue($this->_acl->isAllowed(array('staff', 'admin'), null, 'write'));
+
+        $this->_acl->deny('admin', null, 'write');
+        $this->assertFalse($this->_acl->isAllowed(array('staff', 'admin'), null, 'write'));
+
+    }
+
+    /**
      * Ensures that assertions on privileges work properly for a particular Role
      *
      * @return void
Index: library/Zend/Acl.php
===================================================================
--- library/Zend/Acl.php	(révision 18530)
+++ library/Zend/Acl.php	(copie de travail)
@@ -704,10 +704,13 @@
     }
 
     /**
-     * Returns true if and only if the Role has access to the Resource
+     * Returns true if and only if the Role (or one of the Roles) has access to the Resource
      *
      * The $role and $resource parameters may be references to, or the string identifiers for,
-     * an existing Resource and Role combination.
+     * an existing Resource and Role combination. It is also possible to pass an array of
+     * such (instances, references or string) to specify multiple Roles to check privilege
+     * against. In this case, true will be returned as of ONE of the Role is granted privilege,
+     * otherwise the method will return false.
      *
      * If either $role or $resource is null, then the query applies to all Roles or all Resources,
      * respectively. Both may be null to query whether the ACL has a "blacklist" rule
@@ -724,6 +727,25 @@
      * and its respective parents are checked similarly before the lower-priority parents of
      * the Role are checked.
      *
+     * @param  Zend_Acl_Role_Interface|string|array     $role
+     * @param  Zend_Acl_Resource_Interface|string $resource
+     * @param  string                             $privilege
+     * @return boolean
+     */
+    public function isAllowed($role = null, $resource = null, $privilege = null)
+    {
+        $roles = (!is_array($role)) ? array($role) : $role;
+        foreach($roles as $role) {
+            if($this->_isAllowed($role, $resource, $privilege)) return true;
+        }
+        // none of given Roles were granted privilege to ressource...
+        return false;
+    }
+
+
+    /**
+     * Returns true if and only if the Role has access to the Resource
+     *
      * @param  Zend_Acl_Role_Interface|string     $role
      * @param  Zend_Acl_Resource_Interface|string $resource
      * @param  string                             $privilege
@@ -731,7 +753,7 @@
      * @uses   Zend_Acl_Role_Registry::get()
      * @return boolean
      */
-    public function isAllowed($role = null, $resource = null, $privilege = null)
+    protected function _isAllowed($role = null, $resource = null, $privilege = null)
     {
         // reset role & resource to null
         $this->_isAllowedRole = $this->_isAllowedResource = null;