Multiple Domain

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No. You have to set additional domains, DNS, and everything else to use this plugin.

Nope. If you want a complex set up like this, you may be interested in WordPress Multisite. It's delivered with every WordPress installation since 3.0, you can find more info here: https://codex.wordpress.org/Create_A_Network.

Absolutely. You can use the MULTIPLE_DOMAIN_DOMAIN and MULTIPLE_DOMAIN_ORIGINAL_DOMAIN constants to get the current and original domains. Just notice that since the value of the first one is checked against plugin settings, it may not reflect the actual domain in HTTP_HOST element from $_SERVER or user's browser. They also may include the host port when it's different than 80 (default HTTP port) or 443 (default HTTPS port). Notice: in prior versions these constants were wrongly prefixed with MULTPLE_, missing the "I". The old constants are now deprecated. They still available for backcompat but will be removed in future releases.

Yes. You can use the multiple_domain_redirect action to do that. Please check https://github.com/straube/multiple-domain/issues/2 for an example on how to do that.

Yes. You can use the MULTIPLE_DOMAIN_DOMAIN_LANG constant to get the language associated with the current domain. Keep in mind the value in this constant doesn't necessarily reflect the actual user language or locale. This is just the language set in the plugin config. Also notice the language may be null. Notice: in prior versions these constants were wrongly prefixed with MULTPLE_, missing the "I". The old constants are now deprecated. They still available for backcompat but will be removed in future releases.

Yes. There is a shortcode available for that. Just add [multiple_domain] to the post/page and it'll be replaced by the current domain when viewing the content. You can write things like "Welcome to [multiple_domain]!", which would be rendered as "Welcome to mydomain.com!".

Any domain you're site is served from must be added to the plugin configuration. Even www variations and the original domain where your WordPress was installed in must be added. You'll probably see some unexpected output when accessing the site from a non-mapped domain.

Yes. You may notice that even if you don't set a language for any domain, you still get a default hreflang tag in your page head. To disable this behavior, follow the instructions from https://github.com/straube/multiple-domain/issues/51.

Under certain circumstances, in the case of a wrong configuration, you may not be able to log in to the admin area and your page will be redirected. In this case, there are two ways to solve this.

1. Delete the plugin directory wp-content/plugins/multiple-domain. You should be able to do that from the hosting panel, from an FTP client, or via SSH. The downside of this technique is that it won’t be possible to install the plugin again since the configuration will still be in the database.
2. Remove the plugin configuration from the database using the following SQL query DELETE FROM {YOUR-PREFIX}_options WHERE option_name LIKE 'multiple-domain-%'; (Remember to replace the prefix from your own table name). This can be done from the hosting panel when PHPMyAdmin is available or using a MySQL client.