Issue #2996519 by DamienMcKenna, joseph.olstad, Pol: PHP 7.2 compatibility - make sure some variables are arrays in theme_links()

CHANGELOG.txt

@@ -12,6 +12,7 @@ Drupal 7.xx, xxxx-xx-xx (development version)
 - PHP 7.2: Removed deprecated function each().
 - PHP 7.2: Avoid count() calls on uncountable variables.
 - PHP 7.2: Removed deprecated create_function() call.
+- PHP 7.2: Make sure variables are arrays in theme_links().
 - Fixed theme-settings.php not being loaded on cached forms
 
 Drupal 7.59, 2018-04-25

includes/theme.inc

@@ -1776,8 +1776,8 @@ function theme_link($variables) {
  *     http://www.w3.org/TR/WCAG-TECHS/H42.html for more information.
  */
 function theme_links($variables) {
-  $links = $variables['links'];
-  $attributes = $variables['attributes'];
+  $links = (array) $variables['links'];
+  $attributes = (array) $variables['attributes'];
   $heading = $variables['heading'];
   global $language_url;
   $output = '';