From ba6e201a8bf8311f04e52f1e25b7f79ba040d3df Mon Sep 17 00:00:00 2001
From: Chris Brown <drbyte@zen-cart.com>
Date: Thu, 19 Aug 2021 16:38:28 -0400
Subject: [PATCH] Ensure ctype_digit param is a string, per PHP 8.1 requirement

---
 includes/modules/payment/paypaldp.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/includes/modules/payment/paypaldp.php b/includes/modules/payment/paypaldp.php
index da2b26e972..4e42816a4b 100644
--- a/includes/modules/payment/paypaldp.php
+++ b/includes/modules/payment/paypaldp.php
@@ -2422,7 +2422,7 @@ function get_authentication_error() {
   //   MAPs will return the appropriate error code.
   function getISOCurrency($curr) {
     $out = "";
-    if(ctype_digit($curr) || is_int($curr)) {
+    if(is_int($curr) || ctype_digit((string)$curr)) {
       $numCurr = $curr + 0;
       if($numCurr < 10) {
         $out = "00" . $numCurr;