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<?php
namespace Drupal\Core\Form;
/**
* Provides helpers for HTML option groups.
*/
class OptGroup {
/**
* Allows PHP array processing of multiple select options with the same value.
*
* Used for form select elements which need to validate HTML option groups
* and multiple options which may return the same value. Associative PHP
* arrays cannot handle these structures, since they share a common key.
*
* @param array $array
* The form options array to process.
*
* @return array
* An array with all hierarchical elements flattened to a single array.
*/
public static function flattenOptions(array $array) {
$options = [];
static::doFlattenOptions($array, $options);
return $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.
*
* @param array $array
* The form options array to process.
* @param 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;
}
}
}
}