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Database abstraction layer |
Allow the use of different database servers using the same code base. |
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File interface |
Common file handling functions. |
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Form generation |
Functions to enable output of HTML forms and form elements. |
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Formatting |
Functions to format numbers, strings, dates, etc. |
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Hooks |
Allow modules to interact with the Drupal core. |
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Input validation |
Functions to validate user input. |
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Menu system |
Define the navigation menus, and route page requests to code based on URLs. |
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Node access rights |
The node access system determines who can do what to which nodes. |
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Search interface |
The Drupal search interface manages a global search mechanism. |
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Themeable functions |
Functions that display HTML, and which can be customized by themes. |
