Provides helpers for HTML option groups.
| Name | Modifiers | Type | Description |
|---|---|---|---|
| OptGroup::doFlattenOptions | protected static | function | Iterates over an array building a flat array with duplicate keys removed. |
| OptGroup::flattenOptions | public static | function | Allows PHP array processing of multiple select options with the same value. |
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!OptGroup.php/class/OptGroup/8.1.x