How does wordpress multisite manage subdomains?

During the load process, WP loads wp-settings.php, which calls is_multsite(), which checks for the multisite constant defined in wp-config.php if it is a multisite install. If it is multisite, then ms-settings.php is loaded. Inside ms-settings.php, WordPress parses the requested URI to get the domain, and calls wpmu_current_site() to set all of the current site constants based on that domain.

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