Ensure checksum is always 4 digits

zionsg · Mar 10, 2021 · 5d25096 · 5d25096
1 parent bfa4e52
commit 5d25096
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/SgQr/Parser.php b/src/SgQr/Parser.php
@@ -139,7 +139,7 @@ public function computeChecksum($text, $polynomialHex = 0x1021, $initialValue =
             }
         }
 
-        return strtoupper(dechex($result));
+        return str_pad(strtoupper(dechex($result)), 4, '0', STR_PAD_LEFT); // ensure 4 chars cos result may be shorter
     }
 
     /**