Move the internals of `get_network_by_path()` to `WP_Network()` and allow network objects to be retrieved by passing a requested domain and path.
Props johnjamesjacoby, jeremyfelt, drewapicture, wonderboymusic.
See #31985.
git-svn-id: https://develop.svn.wordpress.org/trunk@34099 602fd350-edb4-49c9-b593-d223f7449a82
A `WP_Network` object initially matches a row from `wp_site` and is populated with additional properties used by WordPress core. The first iteration is used to retrieve an existing network based on data passed to the class.
* A network can be retrieved by its ID through `WP_Network::get_instance()`, following in the steps of `WP_Post` and `WP_Comment`.
* A network object can be created or completed by passing initial properties in as a standard object to `new WP_Network()`.
Using these methods, we are now able to populate the global `$current_site` during load via this class.
Props johnjamesjacoby, jeremyfelt, drewapicture, wonderboymusic.
See #31985.
git-svn-id: https://develop.svn.wordpress.org/trunk@34097 602fd350-edb4-49c9-b593-d223f7449a82
