Preprocessing Fields from a Module in Drupal 7

If you're looking to preprocess a field in Drupal 7, you can use hook_preprocess_HOOK. The first "hook" is the name of your module. The second "HOOK" is the theme hook you want to preprocess (e.g. theme_node, theme_block, theme_link, theme_field). You can fine an exhustive list of the Drupal theme hooks by searching the Drupal API.

Here is a simple example of how to use it with fields.

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