判断子域名是否已经存在（多站点）

描述

Check whether a blogname is already taken.

Used during the new site registration process to ensure that each blogname is unique.

用法

<?php domain_exists( $domain, $path, $site_id ); ?>

参数

$domain

(string) (必填) The domain to be checked.

默认值: None

$path

(string) (必填) The path to be checked.

默认值: None

$site_id

(int) (可选) Optional. Relevant only on multi-network installs.

默认值: 1

返回值

(int) 

历史

• 添加于 版本: MU
• ‘domain_exists’ filter added in 3.5

• 原文：http://codex.wordpress.org/Function_Reference/domain_exists