protected static function ListIntegerItem::validateAllowedValue in Drupal 8

Same name and namespace in other branches

1. 9 core/modules/options/src/Plugin/Field/FieldType/ListIntegerItem.php \Drupal\options\Plugin\Field\FieldType\ListIntegerItem::validateAllowedValue()

Checks whether a candidate allowed value is valid.

Parameters

string $option: The option value entered by the user.

Return value

string The error message if the specified value is invalid, NULL otherwise.

Overrides ListItemBase::validateAllowedValue

File

core/modules/options/src/Plugin/Field/FieldType/ListIntegerItem.php, line 66

Class

ListIntegerItem

Plugin implementation of the 'list_integer' field type.

Namespace

Drupal\options\Plugin\Field\FieldType

Code

protected static function validateAllowedValue($option) {
  if (!preg_match('/^-?\\d+$/', $option)) {
    return t('Allowed values list: keys must be integers.');
  }
}