Alter the data being saved to the {menu_router} table after hook_menu is invoked.
This hook is invoked by menu_router_build(). The menu definitions are passed in by reference. Each element of the $items array is one item returned by a module from hook_menu. Additional items may be added, or existing items altered.
$items: Associative array of menu router definitions returned from hook_menu().
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
function hook_menu_alter(&$items) {
// Example - disable the page at node/add
$items['node/add']['access callback'] = FALSE;
}