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I have a form in my website with id: sample_test_custom_form. I have used hook_form_alter in a custom module to alter this form. I also have a preprocess function (mytheme_preprocess_sample_test_custom_form) to do a little preprocessing.

However the alter function and the preprocess function are a little dependent on each other.

So I ask, what is the execution sequence of these function? Which of them is executed first?

1 Answer 1

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Here's a diagram of the form build workflow in Drupal 7

Drupal 7 form building process

More info: https://drupal.org/node/165104

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  • It is quite informative but doesn't say anything about the preprocessing unless preprocessing is a part of form building. Is it?
    – kmdhrm
    Nov 19, 2013 at 10:15
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    Preprocessing is part of the theme layer. It will happen after form_alter Nov 19, 2013 at 10:25

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