AppserverIo\Appserver\PersistenceContainer\StatefulSessionBeanMap::exists PHP Метод

This method checks if the element with the passed key exists in the Collection.

public exists ( mixed $key ) : boolean
$key	mixed	Holds the key to check the elements of the Collection for
Результат	boolean	Returns true if an element with the passed key exists in the Collection

    public function exists($key)
    {
        return isset($this->items[$key]);
    }

StatefulSessionBeanMap