underscore($str)

password_needs_rehash()

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

password_get_info($hash)

random_element($array)

update_batch($table[, $set = NULL[, $value = NULL[, $batch_size = 100]]])

message($body)

set_cookie($name = ''[, $value = ''[, $expire = ''[, $domain = ''[, $path = '/'[, $prefix = ''[, $secure = FALSE[, $httponly = FALSE]]]]]]])

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

class CI_Input $raw_input_stream Read only property that will return php://input