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To migrate WordPress single site to multi-site mode, follow the following steps: 1. Add define('WP_ALLOW_MULTISITE', true); enable multi-site function; 2. Select subdomain or subdirectory mode according to requirements; 3. Enter the "Network Installation" interface to fill in information and modify the configuration files and .htaccess rules as prompted; 4. After logging in to the background again, check whether the multi-site management interface is normal; 5. Manually activate the themes and plug-ins of each site and test compatibility; 6. Set permissions and security measures to ensure that the super administrator's permissions are controlled; 7. If you need to open registration, you should enable the corresponding options and limit the risk of spam sites. The entire process needs to be operated with caution to avoid errors.

Migrating a single WordPress site to a multisite mode is actually not complicated, but several key steps need to be paid attention to. Many people think that just enable Multisite, but in fact, if you do it accidentally, the website may be inaccessible or configuration errors.

Here are some key points and suggestions you must know.

Enable Multisite mode is the first step

WordPress itself supports multi-site functionality, but it is turned off by default. You need to manually add a line of code to the wp-config.php file to enable it:

 define('WP_ALLOW_MULTISITE', true);

After adding this line of code, refresh the "Tools" page in the background and you will see the option of "Network Installation". Don't rush to continue at this time. First, confirm whether your website structure is suitable for using subdomain or subdirectory mode.

• Subdomain mode : such as site1.example.com, site2.example.com.
• Subdirectory mode : such as example.com/site1, example.com/site2.

Before choosing, think about your SEO and brand strategy, because once selected, subsequent changes will be more troublesome.

Modify the configuration file and set up the network

After entering the "Network Installation" interface, fill in the network title, administrator email and other information, and then click "Install". The system will give several code snippets that you need to modify manually, including:

• Add in wp-config.php :

   define('MULTISITE', true);
  define('SUBDOMAIN_INSTALL', true); // or false, depending on whether you choose a subdomain or subdirectory $base = '/';
  define('DOMAIN_CURRENT_SITE', 'yourdomain.com');
  define('PATH_CURRENT_SITE', '/');
  define('SITE_ID_CURRENT_SITE', 1);
  define('BLOG_ID_CURRENT_SITE', 1);

• Also replace with a new rule in the .htaccess file (if it is an Apache environment).

After completing these modifications, log in to the background again and you will find that the original menu has become a multi-site management interface.

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Data migration and plug-in compatibility check

Although multi-sites are enabled, the original website is now just one of them (the Site ID is usually 1). You can manage other newly created sites through My Site > Website.

But a few things to note:

• The original themes and plugins will not be automatically applied to the new site, you need to activate them one by one.
• Some plugins do not support multi-site mode, especially those that operate directly on databases.
• If you have a large number of users, you may want to consider how they are assigned to different sites.

It is recommended that you go through the process in the local test environment before the official migration to ensure that there are no compatibility issues.

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Don't ignore permissions and security settings

Super administrator privileges in a multi-site network are very high and can access all subsites. therefore:

• Make sure only trusted people have super administrator privileges.
• Use a strong password and enable two-step verification.
• Update cores, themes, and plugins regularly.

In addition, if you plan to let users register a site by themselves, remember to turn on the registration option and set appropriate restrictions to avoid the flooding of garbage sites.

Basically that's it. The whole process is not difficult, but every step cannot be skipped or handled sloppy.

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