php wordpress password change - logging me out!

Question

I'm trying to build a simple wordpress password change script of my own (well, based on a plugin really) - the password is successfully changed - but it logs me out after the change completes! Below is the code used. Can anyone see where I'm being logged out and how to prevent it? Thanks!

$update = $wpdb->query($wpdb->prepare("UPDATE {$wpdb->users} SET `user_pass` = %s WHERE `ID` = %d",array(wp_hash_password($_POST['admin_pass1']),$user_ID)));

if(!is_wp_error($update))
{
    wp_cache_delete($user_ID,'users');
    wp_cache_delete($user->user_login,'userlogins');
    wp_logout();
    if (wp_signon(array('user_login'=>$user->user_login,'user_password'=>$_POST['admin_pass1']),false)):
        wp_redirect(admin_url());
    endif;
    ob_start();
}

Answer 1

After resetting password you have to set/reset cookies (http://codex.wordpress.org/Function_Reference/wp_set_auth_cookie)
like this

$update = $wpdb->query($wpdb->prepare("UPDATE {$wpdb->users} SET `user_pass` = %s WHERE `ID` = %d",array(wp_hash_password($_POST['admin_pass1']),$user_ID)));

if(!is_wp_error($update))
{
    wp_cache_delete($user_ID,'users');
    wp_cache_delete($user->user_login,'userlogins');
    wp_logout();
    if (wp_signon(array('user_login'=>$user->user_login,'user_password'=>$_POST['admin_pass1']),false)):
        wp_redirect(admin_url());
    endif;
    ob_start();
}else{
    wp_set_auth_cookie( $current_user_id, true);
}

To reset the password you'd better use wordpress functions like wp_check_password and wp_set_password because of integration with other applications/plugins.