cchapter.php

См. документацию.

<?php
class CChapter
{
    // simple & stupid stub
    public static function GetNavChain ($courseId, $chapterId)
    {
        global $DB;
 
        $rc = $DB->Query("SELECT ID FROM b_learn_lesson WHERE ID < 0 AND ID = 13");
        return ($rc);
    }
}