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I want to execute my custom submission handler for a button before any other submission handler associated with that button. How could I do this?

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array_unshift() the name of the function onto the "#submit" array of the button.

  • This is valid also for $form['#submit'] for which the code is similar to array_unshift($form['#submit'], 'mymodule_form_submit'). – kiamlaluno Aug 17 '11 at 12:54
  • @kiamlaluno Me thinks this would affect all buttons on the form. – Oswald Aug 17 '11 at 19:01
  • I know; I was pointing out to who reads that the same code can be used with $form['#submit'], not that in this case the code should alter both the buttons' submission handler and the form submission handler. – kiamlaluno Aug 17 '11 at 19:59
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You should add it at the first position in handlers array.

$form['actions']['submit']['#submit'] = array_merge( array('your_form_submit'), $form['actions']['submit']['#submit']);

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