CakePHP reorder acl tree

acl_reorder.php

/**
* This is a maint function to recover/reorder the
*  lft/rght columns of the aco and aro models.
* 
*/
public function recover_acl_tree( ) {
    App::Import('Model', 'Aco' );
    App::Import('Model', 'Aro' );
    $Aco = new Aco;
    $Aro = new Aro;
    if ( !$Aco->recover() || !$Aro->recover() ) {
        echo 'Error recovering acl tree';
    } else {
        echo 'Aros and Acos reordered.'; 
    }
    exit;
}