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Contains filters are case sensitve
Namesort descending Description
Database abstraction layer Allow the use of different database servers using the same code base.
Extra system updates for 5.x
File interface Common file handling functions.
Form generation Functions to enable the processing and display of HTML forms.
Formatting Functions to format numbers, strings, dates, etc.
Hook implementations for user-created content types.
Hooks Allow modules to interact with the Drupal core.
Input validation Functions to validate user input.
Menu system Define the navigation menus, and route page requests to code based on URLs.
Node access rights The node access system determines who can do what to which nodes.
Search interface The Drupal search interface manages a global search mechanism.
System updates from 4.7 to 5.0
System updates from 5.0 to x.x @todo Start this series of updates at 2000.
Themeable functions Functions that display HTML, and which can be customized by themes.

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