El código que publicó en ese tutorial (muy bonito, por cierto) publica el formulario en el módulo incorporado "restablecer contraseña" que redirige al login.php por error, pero puede cambiar eso y construir el suyo basado en el original y agregar a la página de plantilla, cambie:
<form method="post" action="<?php echo site_url('wp-login.php?action=lostpassword', 'login_post') ?>" class="wp-user-form">
<div class="username">
<label for="user_login" class="hide"><?php _e('Username or Email'); ?>: </label>
<input type="text" name="user_login" value="" size="20" id="user_login" tabindex="1001" />
</div>
<div class="login_fields">
<?php do_action('login_form', 'resetpass'); ?>
<input type="submit" name="user-submit" value="<?php _e('Reset my password'); ?>" class="user-submit" tabindex="1002" />
<?php $reset = $_GET['reset']; if($reset == true) { echo '<p>A message will be sent to your email address.</p>'; } ?>
<input type="hidden" name="redirect_to" value="<?php echo $_SERVER['REQUEST_URI']; ?>?reset=true" />
<input type="hidden" name="user-cookie" value="1" />
</div>
</form>
a:
<form method="post" action="<?php echo $_SERVER['REQUEST_URI']; ?>" class="wp-user-form">
<div class="username">
<label for="user_login" class="hide"><?php _e('Username or Email'); ?>: </label>
<input type="text" name="user_login" value="" size="20" id="user_login" tabindex="1001" />
</div>
<div class="login_fields">
<?php do_action('login_form', 'resetpass'); ?>
<input type="submit" name="user-submit" value="<?php _e('Reset my password'); ?>" class="user-submit" tabindex="1002" />
<?php
if (isset($_POST['reset_pass']))
{
global $wpdb;
$username = trim($_POST['user_login']);
$user_exists = false;
if (username_exists($username))
{
$user_exists = true;
$user_data = get_userdatabylogin($username);
} elseif (email_exists($username))
{
$user_exists = true;
$user = get_user_by_email($username);
} else
{
$error[] = '<p>' . __('Username or Email was not found, try again!') . '</p>';
}
if ($user_exists)
{
$user_login = $user->user_login;
$user_email = $user->user_email;
// Generate something random for a password... md5'ing current time with a rand salt
$key = substr(md5(uniqid(microtime())), 0, 8);
// Now insert the new pass md5'd into the db
$wpdb->query("UPDATE $wpdb->users SET user_activation_key = '$key' WHERE user_login = '$user_login'");
//create email message
$message = __('Someone has asked to reset the password for the following site and username.') . "\r\n\r\n";
$message .= get_option('siteurl') . "\r\n\r\n";
$message .= sprintf(__('Username: %s'), $user_login) . "\r\n\r\n";
$message .= __('To reset your password visit the following address, otherwise just ignore this email and nothing will happen.') . "\r\n\r\n";
$message .= get_option('siteurl') . "/wp-login.php?action=rp&key=$key\r\n";
//send email meassage
if (FALSE == wp_mail($user_email, sprintf(__('[%s] Password Reset'), get_option('blogname')), $message))
$error[] = '<p>' . __('The e-mail could not be sent.') . "<br />\n" . __('Possible reason: your host may have disabled the mail() function...') . '</p>';
}
if (count($error) > 0)
{
foreach ($error as $e)
{
echo $e . '<br/>';
}
} else
{
echo '<p>' . __('A message will be sent to your email address.') . '</p>';
}
}
?>
<input type="hidden" name="reset_pass" value="1" />
<input type="hidden" name="user-cookie" value="1" />
</div>
</form>
username_exists()
ayudarte de alguna manera?