get_active_blog_for_user( int $user_id ): WP_Site|void

45function get_active_blog_for_user( $user_id ) {46	$blogs = get_blogs_of_user( $user_id );47	if ( empty( $blogs ) ) {48		return;49	}50 51	if ( ! is_multisite() ) {52		return $blogs[ get_current_blog_id() ];53	}54 55	$primary_blog = get_user_meta( $user_id, 'primary_blog', true );56	$first_blog   = current( $blogs );57	if ( false !== $primary_blog ) {58		if ( ! isset( $blogs[ $primary_blog ] ) ) {59			update_user_meta( $user_id, 'primary_blog', $first_blog->userblog_id );60			$primary = get_site( $first_blog->userblog_id );61		} else {62			$primary = get_site( $primary_blog );63		}64	} else {65		// TODO: Review this call to add_user_to_blog too - to get here the user must have a role on this blog?66		$result = add_user_to_blog( $first_blog->userblog_id, $user_id, 'subscriber' );67 68		if ( ! is_wp_error( $result ) ) {69			update_user_meta( $user_id, 'primary_blog', $first_blog->userblog_id );70			$primary = $first_blog;71		}72	}73 74	if ( ( ! is_object( $primary ) ) || ( 1 == $primary->archived || 1 == $primary->spam || 1 == $primary->deleted ) ) {75		$blogs = get_blogs_of_user( $user_id, true ); // If a user's primary blog is shut down, check their other blogs.76		$ret   = false;77		if ( is_array( $blogs ) && count( $blogs ) > 0 ) {78			foreach ( (array) $blogs as $blog_id => $blog ) {79				if ( get_current_network_id() != $blog->site_id ) {80					continue;81				}82				$details = get_site( $blog_id );83				if ( is_object( $details ) && 0 == $details->archived && 0 == $details->spam && 0 == $details->deleted ) {84					$ret = $details;85					if ( get_user_meta( $user_id, 'primary_blog', true ) != $blog_id ) {86						update_user_meta( $user_id, 'primary_blog', $blog_id );87					}88					if ( ! get_user_meta( $user_id, 'source_domain', true ) ) {89						update_user_meta( $user_id, 'source_domain', $details->domain );90					}91					break;92				}93			}94		} else {95			return;96		}97		return $ret;98	} else {99		return $primary;100	}101}