en caso de que quiera manejar esto usted mismo, esto es lo que uso:
add_action('template_redirect', 'register_a_user');
function register_a_user(){
if(isset($_GET['do']) && $_GET['do'] == 'register'):
$errors = array();
if(empty($_POST['user']) || empty($_POST['email'])) $errors[] = 'provide a user and email';
if(!empty($_POST['spam'])) $errors[] = 'gtfo spammer';
$user_login = esc_attr($_POST['user']);
$user_email = esc_attr($_POST['email']);
require_once(ABSPATH.WPINC.'/registration.php');
$sanitized_user_login = sanitize_user($user_login);
$user_email = apply_filters('user_registration_email', $user_email);
if(!is_email($user_email)) $errors[] = 'invalid e-mail';
elseif(email_exists($user_email)) $errors[] = 'this email is already registered, bla bla...';
if(empty($sanitized_user_login) || !validate_username($user_login)) $errors[] = 'invalid user name';
elseif(username_exists($sanitized_user_login)) $errors[] = 'user name already exists';
if(empty($errors)):
$user_pass = wp_generate_password();
$user_id = wp_create_user($sanitized_user_login, $user_pass, $user_email);
if(!$user_id):
$errors[] = 'registration failed...';
else:
update_user_option($user_id, 'default_password_nag', true, true);
wp_new_user_notification($user_id, $user_pass);
endif;
endif;
if(!empty($errors)) define('REGISTRATION_ERROR', serialize($errors));
else define('REGISTERED_A_USER', $user_email);
endif;
}
el código es casi idéntico al de la página de registro del usuario.
luego agregue su formulario en su plantilla:
<?php
if(defined('REGISTRATION_ERROR'))
foreach(unserialize(REGISTRATION_ERROR) as $error)
echo "<div class=\"error\">{$error}</div>";
// errors here, if any
elseif(defined('REGISTERED_A_USER'))
echo 'a email has been sent to '.REGISTERED_A_USER;
?>
<form method="post" action="<?php echo add_query_arg('do', 'register', home_url('/')); ?>">
<label>
User:
<input type="text" name="user" value=""/>
</label>
<label>
Email:
<input type="text" name="email" value="" />
</label>
<label>
Delete this text:
<input type="text" name="spam" value="some_crappy_spam_protection" />
</label>
<input type="submit" value="register" />
</form>
puedes crear un widget con esto, un shortcode o simplemente la plantilla de página habitual ...