core-bundle/src/Resources/contao/forms/FormRadioButton.php
protected function getOptions()
	{
		$arrOptions = array();
		$blnHasGroups = false;

		foreach ($this->arrOptions as $i=>$arrOption)
		{
			if ($arrOption['group'])
			{
				if ($blnHasGroups)
				{
					$arrOptions[] = array
					(
						'type' => 'group_end'
					);
				}

				$arrOptions[] = array
				(
					'type'  => 'group_start',
					'label' => StringUtil::specialchars($arrOption['label'])
				);

				$blnHasGroups = true;
			}
			else
			{
				$arrOptions[] = array_replace
				(
					$arrOption,
					array
					(
						'type'       => 'option',
						'name'       => $this->strName,
						'id'         => $this->strId . '_' . $i,
						'value'      => $arrOption['value'],
						'checked'    => $this->isChecked($arrOption),
						'attributes' => $this->getAttributes(),
						'label'      => $arrOption['label']
					)
				);
			}
		}

		if ($blnHasGroups)
		{
			$arrOptions[] = array
			(
				'type' => 'group_end'
			);
		}

		return $arrOptions;
	}
protected function getOptions()
	{
		$arrOptions = array();
		$blnHasGroups = false;

		foreach ($this->arrOptions as $i=>$arrOption)
		{
			if ($arrOption['group'])
			{
				if ($blnHasGroups)
				{
					$arrOptions[] = array
					(
						'type' => 'group_end'
					);
				}

				$arrOptions[] = array
				(
					'type'  => 'group_start',
					'label' => StringUtil::specialchars($arrOption['label'])
				);

				$blnHasGroups = true;
			}
			else
			{
				$arrOptions[] = array_replace
				(
					$arrOption,
					array
					(
						'type'       => 'option',
						'name'       => $this->strName,
						'id'         => $this->strId . '_' . $i,
						'value'      => $arrOption['value'],
						'checked'    => $this->isChecked($arrOption),
						'attributes' => $this->getAttributes(),
						'label'      => $arrOption['label']
					)
				);
			}
		}

		if ($blnHasGroups)
		{
			$arrOptions[] = array
			(
				'type' => 'group_end'
			);
		}

		return $arrOptions;
	}
Generate the options

@return array The options array