Smarty 3.1.13 - see changelog

bundled-libs/Smarty/libs/plugins/function.html_checkboxes.php

@@ -116,6 +116,23 @@ function smarty_function_html_checkboxes($params, $template)
             case 'assign':
                 break;
 
+            case 'strict': break;
+
+            case 'disabled':
+            case 'readonly':
+                if (!empty($params['strict'])) {
+                    if (!is_scalar($_val)) {
+                        trigger_error("html_options: $_key attribute must be a scalar, only boolean true or string '$_key' will actually add the attribute", E_USER_NOTICE);
+                    }
+
+                    if ($_val === true || $_val === $_key) {
+                        $extra .= ' ' . $_key . '="' . smarty_function_escape_special_chars($_key) . '"';
+                    }
+
+                    break;
+                }
+                // omit break; to fall through!
+
             default:
                 if(!is_array($_val)) {
                     $extra .= ' '.$_key.'="'.smarty_function_escape_special_chars($_val).'"';