encode_php_tags($str)

display_error([$error = ''[, $swap = ''[, $native = FALSE]]])

form_label([$label_text = ''[, $id = ''[, $attributes = array()]]])

do_upload([$field = 'userfile'])

memory_usage()

base_url()

create_captcha([$data = ''[, $img_path = ''[, $img_url = ''[, $font_path = '']]]])

is_referral()

report([$result = array()])

format_characters($str)