Returns HTML for a radio button form element.
Note: The input "name" attribute needs to be sanitized before output, which is currently done by passing all attributes to drupal_attributes().
$variables: An associative array containing:
function theme_radio($variables) {
$element = $variables['element'];
$element['#attributes']['type'] = 'radio';
element_set_attributes($element, array(
'id',
'name',
'#return_value' => 'value',
));
if (isset($element['#return_value']) && $element['#value'] !== FALSE && $element['#value'] == $element['#return_value']) {
$element['#attributes']['checked'] = 'checked';
}
_form_set_class($element, array(
'form-radio',
));
return '<input' . drupal_attributes($element['#attributes']) . ' />';
}