inc/cron.php

The poor man's cron job. Or, on the bright side: a cron job without configuration needed
Cron jobs are implemented by random on some http requests.

Functions

swCron()

The jobs are rebuild indexes, index random fields and create a sitemap.
If you provide a swInternalCronHook() and return true, the cron job is not executed.
The function is called by index.php

swIndexRandomField

Indexes some fields, as we expect these searches to be executed often

File structure inc folder

swHuntDuplicates($first=)

Normally, record->writecurrent is responsible for unsetting the current bitmap when a new record is written. However, when you rebuild the index, this is not done. This cronjob checks for duplicates and removes earlier versions.
If $first is not set, a random $first is used.