db_set_charset($charset)

set_checkbox($field[, $value = ''[, $default = FALSE]])

initialize([$params = array()])

timespan([$seconds = 1[, $time = ''[, $units = '']]])

get([$index = NULL[, $xss_clean = NULL]])

get_filenames($source_dir[, $include_path = FALSE])

reset_query()

All of the available libraries are located in your system/libraries/ directory. In most cases, to use one of these classes involves initializing it within a

cache_off()

set($key[, $value = ''[, $escape = NULL]])