CodeIgniter comes with a full-featured and very fast abstracted database class that supports both traditional structures and Query Builder patterns. The database functions

hkdf($key[, $digest = 'sha512'[, $salt = NULL[, $length = NULL[, $info = '']]]])

The following page describes the coding styles adhered to when contributing to the development of CodeIgniter. There is no requirement to use these styles in your own CodeIgniter

The following graphic illustrates how data flows throughout the system:

reduce_double_slashes($str)

unbuffered_row([$type = 'object'])

update([$table = ''[, $set = NULL[, $where = NULL[, $limit = NULL]]]])

group_end()

start_cache()

set_value($field[, $default = ''[, $html_escape = TRUE]])