protected static OptGroup::doFlattenOptions(array $array, array &$options)
Iterates over an array building a flat array with duplicate keys removed.
This function also handles cases where objects are passed as array values.
array $array: The form options array to process.
array $options: The array of flattened options.
protected static function doFlattenOptions(array $array, array &$options) { foreach ($array as $key => $value) { if (is_object($value) && isset($value->option)) { static::doFlattenOptions($value->option, $options); } elseif (is_array($value)) { static::doFlattenOptions($value, $options); } else { $options[$key] = $value; } } }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!OptGroup.php/function/OptGroup::doFlattenOptions/8.1.x