BBP_Shortcodes::display_topic_form( array $attr = array(), string $content = '' )

	public function display_topic_form( $attr = array(), $content = '' ) {

		// Sanity check supplied info
		if ( !empty( $content ) || ( !empty( $attr['forum_id'] ) && ( !is_numeric( $attr['forum_id'] ) || !bbp_is_forum( $attr['forum_id'] ) ) ) )
			return $content;

		// Unset globals
		$this->unset_globals();

		// If forum id is set, use the 'bbp_single_forum' query name
		if ( !empty( $attr['forum_id'] ) ) {

			// Set the global current_forum_id for future requests
			bbpress()->current_forum_id = $forum_id = bbp_get_forum_id( $attr['forum_id'] );

			// Start output buffer
			$this->start( 'bbp_single_forum' );

		// No forum id was passed
		} else {

			// Set the $forum_id variable to satisfy checks below
			$forum_id = 0;

			// Start output buffer
			$this->start( 'bbp_topic_form' );
		}

		// If the forum id is set, check forum caps else display normal topic form
		if ( empty( $forum_id ) || bbp_user_can_view_forum( array( 'forum_id' => $forum_id ) ) ) {
			bbp_get_template_part( 'form', 'topic' );

		// Forum is private and user does not have caps
		} elseif ( bbp_is_forum_private( $forum_id, false ) ) {
			bbp_get_template_part( 'feedback', 'no-access' );
		}

		// Return contents of output buffer
		return $this->end();
	}