Cache\Hierarchy\HierarchicalCachePoolTrait::isHierarchyKey PHP Метод

A hierarchy key MUST begin with the separator.

private isHierarchyKey ( string $key ) : boolean
$key	string
Результат	boolean

    private function isHierarchyKey($key)
    {
        return substr($key, 0, 1) === HierarchicalPoolInterface::HIERARCHY_SEPARATOR;
    }

HierarchicalCachePoolTrait