钩入login_form_register 并将用户发送到您的注册页面wp_redirect.

<?php
add_action( \'login_form_register\', \'wpse45134_catch_register\' );
/**
 * Redirects visitors to `wp-login.php?action=register` to 
 * `site.com/register`
 */
function wpse45134_catch_register()
{
    wp_redirect( home_url( \'/register\' ) );
    exit(); // always call `exit()` after `wp_redirect`
}

<?php
add_action( \'login_form_lostpassword\', \'wpse45134_filter_option\' );
add_action( \'login_form_retrievepassword\', \'wpse45134_filter_option\' );
/**
 * Simple wrapper around a call to add_filter to make sure we only
 * filter an option on the login page.
 */
function wpse45134_filter_option()
{
    // use __return_zero because pre_option_{$opt} checks
    // against `false`
    add_filter( \'pre_option_users_can_register\', \'__return_zero\' );
}