_form_validate

• Drupal 4.7
• Drupal 5
• Drupal 6
• Drupal 7

Versions

4.7 – 5

_form_validate($elements, $form_id = NULL)

6 – 7

_form_validate($elements, &$form_state, $form_id = NULL)

Code

includes/form.inc, line 219

<?php
function _form_validate($elements, $form_id = NULL) {
  // Recurse through all children.
  foreach (element_children($elements) as $key) {
    if (isset($elements[$key]) && $elements[$key]) {
      _form_validate($elements[$key]);
    }
  }
  /* Validate the current input */
  if (!$elements['#validated']) {
    if (isset($elements['#needs_validation'])) {
      // An empty textfield returns '' so we use empty(). An empty checkbox
      // and a textfield could return '0' and empty('0') returns TRUE so we
      // need a special check for the '0' string.
      if ($elements['#required'] && empty($elements['#value']) && $elements['#value'] !== '0') {
        form_error($elements, t('%name field is required.', array('%name' => $elements['#title'])));
      }

      // Add legal choice check if element has #options. Can be skipped, but then you must validate your own element.
      if (isset($elements['#options']) && isset($elements['#value']) && !isset($elements['#DANGEROUS_SKIP_CHECK'])) {
        if ($elements['#type'] == 'select') {
          $options = form_options_flatten($elements['#options']);
        }
        else {
          $options = $elements['#options'];
        }
        if (is_array($elements['#value'])) {
          $value = $elements['#type'] == 'checkboxes' ? array_keys(array_filter($elements['#value'])) : $elements['#value'];
          foreach ($value as $v) {
            if (!isset($options[$v])) {
              form_error($elements, t('An illegal choice has been detected. Please contact the site administrator.'));
              watchdog('form', t('Illegal choice %choice in %name element.', array('%choice' => theme('placeholder', check_plain($v)), '%name' => theme('placeholder', empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title']))), WATCHDOG_ERROR);
            }
          }
        }
        elseif (!isset($options[$elements['#value']])) {
          form_error($elements, t('An illegal choice has been detected. Please contact the site administrator.'));
          watchdog('form', t('Illegal choice %choice in %name element.', array('%choice' => theme('placeholder', $elements['#value']), '%name' => theme('placeholder', empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title']))), WATCHDOG_ERROR);
        }
      }
    }

    // User-applied checks.
    if (isset($elements['#validate'])) {
      foreach ($elements['#validate'] as $function => $args) {
        $args = array_merge(array($elements), $args);
        // for the full form we hand over a copy of $form_values
        if (isset($form_id)) {
          $args = array_merge(array($form_id, $GLOBALS['form_values']), $args);
        }
        if (function_exists($function))  {
          call_user_func_array($function, $args);
        }
      }
    }
    $elements['#validated'] = TRUE;
  }
}
?>

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