function bp_get_group_join_button( $group = false ) {
		global $groups_template;

		// Set group to current loop group if none passed.
		if ( empty( $group ) ) {
			$group =& $groups_template->group;
		}

		// Don't show button if not logged in or previously banned.
		if ( ! is_user_logged_in() || bp_group_is_user_banned( $group ) ) {
			return false;
		}

		// Group creation was not completed or status is unknown.
		if ( empty( $group->status ) ) {
			return false;
		}

		// Already a member.
		if ( ! empty( $group->is_member ) ) {

			// Stop sole admins from abandoning their group.
			$group_admins = groups_get_group_admins( $group->id );
			if ( ( 1 == count( $group_admins ) ) && ( bp_loggedin_user_id() === (int) $group_admins[0]->user_id ) ) {
				return false;
			}

			// Setup button attributes.
			$button = array(
				'id'                => 'leave_group',
				'component'         => 'groups',
				'must_be_logged_in' => true,
				'block_self'        => false,
				'wrapper_class'     => 'group-button ' . $group->status,
				'wrapper_id'        => 'groupbutton-' . $group->id,
				'link_href'         => wp_nonce_url( trailingslashit( bp_get_group_permalink( $group ) . 'leave-group' ), 'groups_leave_group' ),
				'link_text'         => __( 'Leave Group', 'buddypress' ),
				'link_class'        => 'group-button leave-group',
			);

		// Not a member.
		} else {

			// Show different buttons based on group status.
			switch ( $group->status ) {
				case 'hidden' :
					return false;

				case 'public':
					$button = array(
						'id'                => 'join_group',
						'component'         => 'groups',
						'must_be_logged_in' => true,
						'block_self'        => false,
						'wrapper_class'     => 'group-button ' . $group->status,
						'wrapper_id'        => 'groupbutton-' . $group->id,
						'link_href'         => wp_nonce_url( trailingslashit( bp_get_group_permalink( $group ) . 'join' ), 'groups_join_group' ),
						'link_text'         => __( 'Join Group', 'buddypress' ),
						'link_class'        => 'group-button join-group',
					);
					break;

				case 'private' :

					// Member has outstanding invitation -
					// show an "Accept Invitation" button.
					if ( $group->is_invited ) {
						$button = array(
							'id'                => 'accept_invite',
							'component'         => 'groups',
							'must_be_logged_in' => true,
							'block_self'        => false,
							'wrapper_class'     => 'group-button ' . $group->status,
							'wrapper_id'        => 'groupbutton-' . $group->id,
							'link_href'         => add_query_arg( 'redirect_to', bp_get_group_permalink( $group ), bp_get_group_accept_invite_link( $group ) ),
							'link_text'         => __( 'Accept Invitation', 'buddypress' ),
							'link_class'        => 'group-button accept-invite',
						);

					// Member has requested membership but request is pending -
					// show a "Request Sent" button.
					} elseif ( $group->is_pending ) {
						$button = array(
							'id'                => 'membership_requested',
							'component'         => 'groups',
							'must_be_logged_in' => true,
							'block_self'        => false,
							'wrapper_class'     => 'group-button pending ' . $group->status,
							'wrapper_id'        => 'groupbutton-' . $group->id,
							'link_href'         => bp_get_group_permalink( $group ),
							'link_text'         => __( 'Request Sent', 'buddypress' ),
							'link_class'        => 'group-button pending membership-requested',
						);

					// Member has not requested membership yet -
					// show a "Request Membership" button.
					} else {
						$button = array(
							'id'                => 'request_membership',
							'component'         => 'groups',
							'must_be_logged_in' => true,
							'block_self'        => false,
							'wrapper_class'     => 'group-button ' . $group->status,
							'wrapper_id'        => 'groupbutton-' . $group->id,
							'link_href'         => wp_nonce_url( trailingslashit( bp_get_group_permalink( $group ) . 'request-membership' ), 'groups_request_membership' ),
							'link_text'         => __( 'Request Membership', 'buddypress' ),
							'link_class'        => 'group-button request-membership',
						);
					}

					break;
			}
		}

		/**
		 * Filters the HTML button for joining a group.
		 *
		 * @since 1.2.6
		 * @since 2.4.0 Added $group parameter to filter args.
		 *
		 * @param string $button HTML button for joining a group.
		 * @param object $group BuddyPress group object
		 */
		return bp_get_button( apply_filters( 'bp_get_group_join_button', $button, $group ) );
	}