- backdrop_requirements_severity in core/
includes/ install.inc - Extracts the highest severity from the requirements array.
- file_requirements in core/
modules/ file/ file.install - Implements hook_requirements().
- image_requirements in core/
modules/ image/ image.install - Implements hook_requirements() to check the PHP GD Library.
- node_requirements in core/
modules/ node/ node.module - Implements hook_requirements().
- system_requirements in core/
modules/ system/ system.install - Implements hook_requirements().
- theme_status_report in core/
modules/ system/ system.theme.inc - Returns HTML for the status report.
- unicode_requirements in core/
includes/ unicode.inc - Returns Unicode library status and errors.
- update_prepare_bootstrap in core/
includes/ update.inc - Performs extra steps required to bootstrap when using a Drupal 7 database.
- _system_check_db_utf8mb4_requirements in core/
modules/ system/ system.install - Checks whether the requirements for multi-byte UTF-8 support are met.