bp_friends_clear_bp_friends_friendships_cache( int $friendship_id, int $initiator_user_id, int $friend_user_id )

function bp_friends_clear_bp_friends_friendships_cache( $friendship_id, $initiator_user_id, $friend_user_id ) {
	// Clear friendship ID cache for each user.
	wp_cache_delete( $initiator_user_id, 'bp_friends_friendships_for_user' );
	wp_cache_delete( $friend_user_id,    'bp_friends_friendships_for_user' );

	// Clear the friendship object cache.
	wp_cache_delete( $friendship_id, 'bp_friends_friendships' );

	// Clear incremented cache.
	$friendship = new stdClass;
	$friendship->initiator_user_id = $initiator_user_id;
	$friendship->friend_user_id    = $friend_user_id;
	bp_friends_delete_cached_friendships_on_friendship_save( $friendship );
}