constant MAINTENANCE_MODE

Global flag to indicate the site is in installation mode.

The constant is defined using define() instead of const so that PHP versions prior to 5.3 can display proper PHP requirements instead of causing a fatal error.

File

core/install.php, line 20: Initiates a browser-based installation of Drupal.

Code

define('MAINTENANCE_MODE', 'install')

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https://api.drupal.org/api/drupal/core!install.php/constant/MAINTENANCE_MODE/8.1.x