diff --git a/libs/plugins/function.html_checkboxes.php b/libs/plugins/function.html_checkboxes.php
index 05fe63c0..6fd272a0 100644
--- a/libs/plugins/function.html_checkboxes.php
+++ b/libs/plugins/function.html_checkboxes.php
@@ -73,7 +73,7 @@ function smarty_function_html_checkboxes($params, &$smarty)
 
             case 'checked':
             case 'selected':
-                $selected = array_values((array)$_val);
+                $selected = array_map('strval', array_values((array)$_val));
                 break;
 
             case 'checkboxes':
@@ -122,7 +122,7 @@ function smarty_function_html_checkboxes_output($name, $value, $output, $selecte
         . smarty_function_escape_special_chars($name) . '[]" value="'
         . smarty_function_escape_special_chars($value) . '"';
 
-    if (in_array($value, $selected, true)) {
+    if (in_array((string)$value, $selected)) {
         $_output .= ' checked="checked"';
     }
     $_output .= $extra . ' />' . $output;
diff --git a/libs/plugins/function.html_options.php b/libs/plugins/function.html_options.php
index fab21753..da5571c5 100644
--- a/libs/plugins/function.html_options.php
+++ b/libs/plugins/function.html_options.php
@@ -48,11 +48,14 @@ function smarty_function_html_options($params, &$smarty)
                 $$_key = (array)$_val;
                 break;
                 
-            case 'selected':
             case 'values':
             case 'output':
                 $$_key = array_values((array)$_val);
                 break;
+
+            case 'selected':
+                $$_key = array_map('strval', array_values((array)$_val));
+                break;
                 
             default:
                 if(!is_array($_val)) {
@@ -95,7 +98,7 @@ function smarty_function_html_options_optoutput($key, $value, $selected) {
     if(!is_array($value)) {
         $_html_result = '<option label="' . smarty_function_escape_special_chars($value) . '" value="' .
             smarty_function_escape_special_chars($key) . '"';
-        if (in_array($key, $selected, true))
+        if (in_array((string)$key, $selected))
             $_html_result .= ' selected="selected"';
         $_html_result .= '>' . smarty_function_escape_special_chars($value) . '</option>' . "\n";
     } else {