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Unset certain values in an unkeyed PHP array

Can't be as complicated as these people make it out to be?
http://dev-tips.com/featured/remove-an-item-from-an-array-by-value

One of Agaric's approaches, below. This foreach allows one to unset just one validation function associated with a form (and adds another one below) without replacing or overriding any other validation callbacks that might be associated with the form (by the initial or other modules).

<?php
     
foreach ($form['#validate'] as $key => $function) {
        if (
$function == 'user_register_validate') {
          unset(
$form['#validate'][$key]);
        }
      }
     
$form['#validate'][] = 'customuser_register_validate';
?>

(Even an "unkeyed" array has an implicit numeric key that we can get items by.)

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Searched words: 
php unset certain values of an array

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