get_request_header($index[, $xss_clean = FALSE])

date_range([$unix_start = ''[, $mixed = ''[, $is_unix = TRUE[, $format = 'Y-m-d']]]])

all_userdata()

CodeIgniter’s Hooks feature provides a means to tap into and modify the inner workings of the framework without hacking the core files. When CodeIgniter runs it follows a specific

get_compiled_update([$table = ''[, $reset = TRUE]])

db_connect($persistent = TRUE)

trans_status()

is_cli()

distinct([$val = TRUE])

set_dbprefix([$prefix = ''])