1 views_handler_filter_in_operator.inc views_handler_filter_in_operator::validate()

Validates the handler against the complete View.

This is called when the complete View is being validated. For validating the handler options form use options_validate().

Return value

Empty array if the handler is valid; an array of error strings if it is not.:

Overrides views_handler::validate

See also



core/modules/views/handlers/views_handler_filter_in_operator.inc, line 399
Definition of views_handler_filter_in_operator.


Simple filter to handle matching of multiple options selectable via checkboxes


function validate() {
  $errors = array();

  // If the operator is an operator which doesn't require a value, there is
  // no need for additional validation.
  if (in_array($this->operator, $this->operator_values(0))) {
    return array();

  if (!in_array($this->operator, $this->operator_values(1))) {
    $errors[] = t('The operator is invalid on filter: @filter.', array('@filter' => $this->ui_name(TRUE)));
  if (is_array($this->value)) {
    if (!isset($this->value_options)) {
      // Don't validate if there are none value options provided, for example for special handlers.
      return $errors;
    if ($this->options['exposed'] && !$this->options['expose']['required'] && empty($this->value)) {
      // Don't validate if the field is exposed and no default value is provided.
      return $errors;

    // Some filter_in_operator usage uses optgroups forms, so flatten it.
    $flat_options = form_options_flatten($this->value_options, TRUE);

    // Remove every element which is not known.
    foreach ($this->value as $value) {
      if (!isset($flat_options[$value])) {
    // Choose different kind of output for 0, a single and multiple values.
    if (count($this->value) == 0) {
      $errors[] = t('No valid values found on filter: @filter.', array('@filter' => $this->ui_name(TRUE)));
  elseif (!empty($this->value) && ($this->operator == 'in' || $this->operator == 'not in')) {
    $errors[] = t('The value @value is not an array for @operator on filter: @filter', array('@value' => print_r($this->value, 1), '@operator' => $this->operator, '@filter' => $this->ui_name(TRUE)));
  return $errors;