drupal 7 hook_node_update

The hook_node_update function in Drupal 7 is an important hook that allows modules to perform actions when a node is updated. It is invoked after the node has been updated in the database. Here is an example of how to implement this hook:

function mymodule_node_update($node) {
  // Perform actions here.

In the example above, mymodule should be replaced with the name of your custom module. The $node parameter represents the updated node object.

Please note that this hook is specific to Drupal 7 and may not be applicable to other versions of Drupal.