constant BACKDROP_REQUIRED

1. 1.17.x modules/system/system.module BACKDROP_REQUIRED
2. 1.15.x modules/system/system.module BACKDROP_REQUIRED
3. 1.16.x modules/system/system.module BACKDROP_REQUIRED

Required option on forms and settings

File

modules/system/system.module, line 40

Configuration system that lets administrators modify the workings of the site.

Code

define('BACKDROP_REQUIRED', 2)