CodeIgniter has a config file that lets you store your database connection values (username, password, database name, etc.). The config file is located at application/config/database

get_id($url)

get_csrf_hash()

get_header($header)

append_output($output)

log_message($level, $message)

Table MetaData These functions let you fetch table information. List the Tables in Your Database

set_profiler_sections($sections)

adjust_date($month, $year)

initialize([$config = array()])