is_mobile([$key = NULL])

set_flashdata($data[, $value = NULL])

As well as calling an applications Controllers via the URL in a browser

display_response()

initialize()

hex2bin($data)

sess_regenerate([$destroy = FALSE])

error_string()

read_file($file)

In order to help out, CodeIgniter uses a series of function, method, class and variable names in its operation. Because of this, some names cannot be used by a developer. Following