如何实现双后缀域名共享同一WordPress站点副本？

Absolutely, this is achievable with a few configuration changes—no need to maintain two separate WordPress installations. Here's how to set it up step by step:

1. Update Your Virtual Host Configuration #

First, you'll need to adjust your web server (Apache/Nginx) settings so both mydomain.com and mydomain.org point to the same WordPress document root, and remove any existing redirect rules for mydomain.com.

For Apache: #

Edit your virtual host files to set the same DocumentRoot for both domains. Example:

# Virtual Host for mydomain.org
<VirtualHost *:80>
    ServerName mydomain.org
    ServerAlias www.mydomain.org
    DocumentRoot /var/www/wordpress
    # Include standard WordPress rewrite rules
    <Directory /var/www/wordpress>
        AllowOverride All
        Require all granted
    </Directory>
</VirtualHost>

# Virtual Host for mydomain.com (no redirect)
<VirtualHost *:80>
    ServerName mydomain.com
    ServerAlias www.mydomain.com
    DocumentRoot /var/www/wordpress
    <Directory /var/www/wordpress>
        AllowOverride All
        Require all granted
    </Directory>
</VirtualHost>

Don't forget to add SSL configurations for both domains (using Let's Encrypt or your certificate provider) to serve HTTPS content securely.

For Nginx: #

Update your server blocks to point both domains to the same root directory:

server {
    listen 80;
    server_name mydomain.org www.mydomain.org;
    root /var/www/wordpress;
    index index.php index.html;

    location / {
        try_files $uri $uri/ /index.php?$args;
    }

    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/run/php/php8.2-fpm.sock;
    }
}

server {
    listen 80;
    server_name mydomain.com www.mydomain.com;
    root /var/www/wordpress;
    index index.php index.html;

    location / {
        try_files $uri $uri/ /index.php?$args;
    }

    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/run/php/php8.2-fpm.sock;
    }
}

Again, add SSL settings for both domains to enforce HTTPS.

2. Configure WordPress to Recognize Both Domains #

WordPress is hardcoded to use the domain you set in its admin settings by default. To make it dynamically adapt to the visitor's domain, add these lines to your wp-config.php file (right above the /* That's all, stop editing! Happy publishing. */ line):

// Dynamically set site URL based on the visitor's domain
define('WP_SITEURL', 'https://' . $_SERVER['HTTP_HOST']);
define('WP_HOME', 'https://' . $_SERVER['HTTP_HOST']);

This ensures WordPress generates links using the domain the visitor is currently on, instead of a fixed one.

3. Fix Existing Media and Content Links #

If you already have media files or content links pointing to mydomain.org, you'll want to make sure those update dynamically too. Add this code to your theme's functions.php file or a custom plugin:

// Ensure all generated URLs use the current domain
add_filter('home_url', 'dynamic_home_url', 10, 4);
function dynamic_home_url($url, $path, $scheme, $blog_id) {
    return esc_url_raw(sprintf(
        '%s://%s/%s',
        $scheme,
        $_SERVER['HTTP_HOST'],
        ltrim($path, '/')
    ));
}

// Update existing attachment URLs in content
add_filter('the_content', 'swap_domain_in_content');
function swap_domain_in_content($content) {
    $old_domain = 'mydomain.org';
    $new_domain = $_SERVER['HTTP_HOST'];
    return str_replace($old_domain, $new_domain, $content);
}

4. Avoid SEO Duplicate Content Issues #

Since both domains will serve identical content, you need to tell search engines which domain is your primary one to avoid duplicate content penalties. Add a canonical tag to all pages by inserting this code into your theme's functions.php:

add_action('wp_head', 'add_canonical_tag');
function add_canonical_tag() {
    // Replace with your preferred primary domain
    $primary_domain = 'https://mydomain.org';
    echo '<link rel="canonical" href="' . esc_url($primary_domain . $_SERVER['REQUEST_URI']) . '" />' . "\n";
}

Alternatively, use an SEO plugin like Yoast SEO to set the canonical domain through its settings.

Final Checks #

• Test both domains in a private browsing window to ensure they load the same content without redirects.
• Verify that all links (navigation, media, posts) use the current domain instead of the old fixed one.
• Make sure SSL certificates are working correctly for both domains to avoid security warnings.

内容的提问来源于stack exchange，提问作者Mapperkids Lee