bbp_get_subscriptions_permalink( int $user_id )

	function bbp_get_subscriptions_permalink( $user_id = 0 ) {
		global $wp_rewrite;

		// Use displayed user ID if there is one, and one isn't requested
		$user_id = bbp_get_user_id( $user_id );
		if ( empty( $user_id ) )
			return false;

		// Allow early overriding of the profile URL to cut down on processing
		$early_profile_url = apply_filters( 'bbp_pre_get_subscriptions_permalink', (int) $user_id );
		if ( is_string( $early_profile_url ) )
			return $early_profile_url;

		// Pretty permalinks
		if ( $wp_rewrite->using_permalinks() ) {
			$url  = $wp_rewrite->root . bbp_get_user_slug() . '/%' . bbp_get_user_rewrite_id() . '%/%' . bbp_get_user_subscriptions_rewrite_id() . '%';
			$user = get_userdata( $user_id );
			if ( ! empty( $user->user_nicename ) ) {
				$user_nicename = $user->user_nicename;
			} else {
				$user_nicename = $user->user_login;
			}
			$url = str_replace( '%' . bbp_get_user_rewrite_id()               . '%', $user_nicename,                    $url );
			$url = str_replace( '%' . bbp_get_user_subscriptions_rewrite_id() . '%', bbp_get_user_subscriptions_slug(), $url );
			$url = home_url( user_trailingslashit( $url ) );

		// Unpretty permalinks
		} else {
			$url = add_query_arg( array(
				bbp_get_user_rewrite_id()           => $user_id,
				bbp_get_user_subscriptions_rewrite_id() => bbp_get_user_subscriptions_slug(),
			), home_url( '/' ) );
		}

		return apply_filters( 'bbp_get_subscriptions_permalink', $url, $user_id );
	}