bbp_get_form_topic_subscribed()

	function bbp_get_form_topic_subscribed() {

		// Get _POST data
		if ( bbp_is_post_request() && isset( $_POST['bbp_topic_subscription'] ) ) {
			$topic_subscribed = (bool) $_POST['bbp_topic_subscription'];

		// Get edit data
		} elseif ( bbp_is_topic_edit() || bbp_is_reply_edit() ) {

			// Get current posts author
			$post_author = bbp_get_global_post_field( 'post_author', 'raw' );

			// Post author is not the current user
			if ( bbp_get_current_user_id() !== $post_author ) {
				$topic_subscribed = bbp_is_user_subscribed_to_topic( $post_author );

			// Post author is the current user
			} else {
				$topic_subscribed = bbp_is_user_subscribed_to_topic( bbp_get_current_user_id() );
			}

		// Get current status
		} elseif ( bbp_is_single_topic() ) {
			$topic_subscribed = bbp_is_user_subscribed_to_topic( bbp_get_current_user_id() );

		// No data
		} else {
			$topic_subscribed = false;
		}

		// Get checked output
		$checked = checked( $topic_subscribed, true, false );

		return apply_filters( 'bbp_get_form_topic_subscribed', $checked, $topic_subscribed );
	}