PHP course_modinfo::get_cms方法代码示例

/**
 * Preloads the list of active filters for all activities (modules) on the course
 * using two database queries.
 *
 * @param course_modinfo $modinfo Course object from get_fast_modinfo
 */
function filter_preload_activities(course_modinfo $modinfo)
{
    global $DB, $FILTERLIB_PRIVATE;
    if (!isset($FILTERLIB_PRIVATE)) {
        $FILTERLIB_PRIVATE = new stdClass();
    }
    // Don't repeat preload
    if (!isset($FILTERLIB_PRIVATE->preloaded)) {
        $FILTERLIB_PRIVATE->preloaded = array();
    }
    if (!empty($FILTERLIB_PRIVATE->preloaded[$modinfo->get_course_id()])) {
        return;
    }
    $FILTERLIB_PRIVATE->preloaded[$modinfo->get_course_id()] = true;
    // Get contexts for all CMs
    $cmcontexts = array();
    $cmcontextids = array();
    foreach ($modinfo->get_cms() as $cm) {
        $modulecontext = context_module::instance($cm->id);
        $cmcontextids[] = $modulecontext->id;
        $cmcontexts[] = $modulecontext;
    }
    // Get course context and all other parents...
    $coursecontext = context_course::instance($modinfo->get_course_id());
    $parentcontextids = explode('/', substr($coursecontext->path, 1));
    $allcontextids = array_merge($cmcontextids, $parentcontextids);
    // Get all filter_active rows relating to all these contexts
    list($sql, $params) = $DB->get_in_or_equal($allcontextids);
    $filteractives = $DB->get_records_select('filter_active', "contextid {$sql}", $params);
    // Get all filter_config only for the cm contexts
    list($sql, $params) = $DB->get_in_or_equal($cmcontextids);
    $filterconfigs = $DB->get_records_select('filter_config', "contextid {$sql}", $params);
    // Note: I was a bit surprised that filter_config only works for the
    // most specific context (i.e. it does not need to be checked for course
    // context if we only care about CMs) however basede on code in
    // filter_get_active_in_context, this does seem to be correct.
    // Build course default active list. Initially this will be an array of
    // filter name => active score (where an active score >0 means it's active)
    $courseactive = array();
    // Also build list of filter_active rows below course level, by contextid
    $remainingactives = array();
    // Array lists filters that are banned at top level
    $banned = array();
    // Add any active filters in parent contexts to the array
    foreach ($filteractives as $row) {
        $depth = array_search($row->contextid, $parentcontextids);
        if ($depth !== false) {
            // Find entry
            if (!array_key_exists($row->filter, $courseactive)) {
                $courseactive[$row->filter] = 0;
            }
            // This maths copes with reading rows in any order. Turning on/off
            // at site level counts 1, at next level down 4, at next level 9,
            // then 16, etc. This means the deepest level always wins, except
            // against the -9999 at top level.
            $courseactive[$row->filter] += ($depth + 1) * ($depth + 1) * $row->active;
            if ($row->active == TEXTFILTER_DISABLED) {
                $banned[$row->filter] = true;
            }
        } else {
            // Build list of other rows indexed by contextid
            if (!array_key_exists($row->contextid, $remainingactives)) {
                $remainingactives[$row->contextid] = array();
            }
            $remainingactives[$row->contextid][] = $row;
        }
    }
    // Chuck away the ones that aren't active.
    foreach ($courseactive as $filter => $score) {
        if ($score <= 0) {
            unset($courseactive[$filter]);
        } else {
            $courseactive[$filter] = array();
        }
    }
    // Loop through the contexts to reconstruct filter_active lists for each
    // cm on the course.
    if (!isset($FILTERLIB_PRIVATE->active)) {
        $FILTERLIB_PRIVATE->active = array();
    }
    foreach ($cmcontextids as $contextid) {
        // Copy course list
        $FILTERLIB_PRIVATE->active[$contextid] = $courseactive;
        // Are there any changes to the active list?
        if (array_key_exists($contextid, $remainingactives)) {
            foreach ($remainingactives[$contextid] as $row) {
                if ($row->active > 0 && empty($banned[$row->filter])) {
                    // If it's marked active for specific context, add entry
                    // (doesn't matter if one exists already).
                    $FILTERLIB_PRIVATE->active[$contextid][$row->filter] = array();
                } else {
                    // If it's marked inactive, remove entry (doesn't matter
                    // if it doesn't exist).
                    unset($FILTERLIB_PRIVATE->active[$contextid][$row->filter]);
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