Name and describe the five conceptual layers in a drupal system.
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Answer / Rani Chaudhary
In a Drupal system, there are five conceptual layers:
1. PHP API Layer: This layer is responsible for defining classes, functions, and variables that are used to develop custom modules. It includes core APIs like hook_menu(), hook_block(), hook_form_alter(), etc.
2. Configuration Layer: This layer manages the configuration settings of Drupal. It allows administrators to manage content types, taxonomy terms, user roles, and more through the user interface.
3. Theme Layer: This layer is responsible for rendering the UI of a Drupal site. It includes core themes like Bartik, Seven, etc., and custom themes created by developers. The theme layer is built using PHP templates (.tpl.php files) and preprocess functions in theme's template.php file.
4. Database Layer: This layer manages the data storage of Drupal. It uses SQL to store and retrieve data from the database.
5. File System Layer: This layer handles file management tasks like uploading, downloading, and managing files.n
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