how to restrict or allow a group to access a specific subsites?

@alexlii Hi Alex, you can use the bpgsites_get_all_possible_groupsites filter to modify the list of sites that are available. For example:

add_filter( 'bpgsites_get_all_possible_groupsites', 'my_sites_filter' );

function my_sites_filter( $sites ) {
	$disallowed_sites = array( 23, 42, 72 ); // how you build this list is up to you
	$allowed_sites = array();
	foreach( $sites AS $site_id ) {
		if ( in_array( $site_id, $disallowed_sites ) ) {
			continue;
		}
		$allowed_sites[] = $site_id;
	}
	return $allowed_sites;
}

Obviously you can be more sophisticated about the source of the site IDs and the checks that you make, or you could reverse the logic and include only specific blogs rather than excluding specific ones. I hope the above gets you going in the right direction.

Cheers, Christian

You can add this code to a custom plugin or your (child) theme’s ‘functions.php’ file.

https://codex.wordpress.org/Functions_File_Explained

Cheers, Christian