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This video covers a topic in Drupal 7 which may or may not be the version you're using. We're keeping this tutorial online as a courtesy to users of Drupal 7, but we consider it archived.

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The event-driven hook system

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    Drupal modules interact by responding to events.
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    And you as a module developer can hook in to these core processes.
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    You may not realize it but with every click,
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    a user is initiating a series of events. A user registers,
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    a node is being displayed, content is being searched.
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    With every event, a module developer has the option to hook in to the data
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    that is being passed around.
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    There is no reason to change what Drupal core does,
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    even if you desire a different outcome.
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    Drupal has a very robust hook system

The Event-Driven Hook System

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This chapter describes how Drupal modules are able respond to specific events through the hook system. A couple of example hooks are implemented in order to see how this process works. This video builds on the demo module we created in the previous chapter.

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