# CodeIgniter User Guide Version 1.7.3

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# Reserved Names

In order to help out, CodeIgniter uses a series of functions and names in its operation. Because of this, some names cannot be used by a developer. Following is a list of reserved names that cannot be used.

### Controller names

Since your controller classes will extend the main application controller you must be careful not to name your functions identically to the ones used by that class, otherwise your local functions will override them. The following is a list of reserved names. Do not name your controller functions any of these:

- Controller
- CI_Base
- _ci_initialize
- _ci_scaffolding
- index

If you are running PHP 4 there are some additional reserved names. These ONLY apply if you are running PHP 4.

- CI_Loader
- config
- database
- dbutil
- dbforge
- file
- helper
- helpers
- language
- library
- model
- plugin
- plugins
- scaffolding
- script
- view
- vars
- _ci_assign_to_models
- _ci_autoloader
- _ci_init_class
- _ci_init_scaffolding
- _ci_is_instance
- _ci_load
- _ci_load_class
- _ci_object_to_array

### Functions

- is_really_writable()
- load_class()
- get_config()
- config_item()
- show_error()
- show_404()
- log_message()
- _exception_handler()
- get_instance()

### Variables

- $config
- $mimes
- $lang

### Constants

- EXT
- FCPATH
- SELF
- BASEPATH
- APPPATH
- CI_VERSION
- FILE_READ_MODE
- FILE_WRITE_MODE
- DIR_READ_MODE
- DIR_WRITE_MODE
- FOPEN_READ
- FOPEN_READ_WRITE
- FOPEN_WRITE_CREATE_DESTRUCTIVE
- FOPEN_READ_WRITE_CREATE_DESTRUCTIVE
- FOPEN_WRITE_CREATE
- FOPEN_READ_WRITE_CREATE
- FOPEN_WRITE_CREATE_STRICT
- FOPEN_READ_WRITE_CREATE_STRICT