Display error message after using isAllowed

Question

For example I have this implementation of the assert method in the class derived from Zend_Acl_Assert_Interface.

function assert(
    Zend_Acl $acl,
    Zend_Acl_Role_Interface $user = null,
    Zend_Acl_Resource_Interface $item = null,
    $privilege = null
) {
    if (!$user instanceof User) throw new Exception("…");
    if (!$item instanceof Item) throw new Exception("…");

    return
        $user->money >= $item->price &&
        $user->rating >= $item->requiredRating;
}

It checks two conditions: user has enought money and user has enought rating. How to display error message to make user know which condition is failed when isAllowed method returns only bool?

Answer 1

simply check them one by one

$error = array();
if(!($user->money >= $item->price))
$error[] = "user money is less then price";

if(!($user->rating >= $item->requiredRating))
$error[] = "user rating less then required rating ";

Zend_Registery::set('acl_error',$error);
if(count($error) == 2) return false;

return true;

you can retrieve acl errors anywhere in your applicating by Zend_Registry::get('acl_error') ; and show it to user as you like.