Fix phpstan errors

Author: casperbakker

src/Types/TypeCode128.php

@@ -214,7 +214,7 @@ public function getBarcodeData(string $code): Barcode
                 // get numeric sequences (if any)
                 $numseq = [];
                 preg_match_all('/([0-9]{4,})/', $code, $numseq, PREG_OFFSET_CAPTURE);
-                if (isset($numseq[1]) AND ! empty($numseq[1])) {
+                if (! empty($numseq[1])) {
                     $end_offset = 0;
                     foreach ($numseq[1] as $val) {
                         $offset = $val[1];
@@ -390,7 +390,7 @@ protected function get128ABsequence($code)
         // get A sequences (if any)
         $numseq = [];
         preg_match_all('/([\x00-\x1f])/', $code, $numseq, PREG_OFFSET_CAPTURE);
-        if (isset($numseq[1]) AND ! empty($numseq[1])) {
+        if (empty($numseq[1])) {
             $end_offset = 0;
             foreach ($numseq[1] as $val) {
                 $offset = $val[1];

src/Types/TypeUpcExtension2.php

@@ -25,7 +25,7 @@ public function getBarcodeData(string $code): Barcode
 
         // Calculate check digit
         if ($len == 2) {
-            $r = $code % 4;
+            $r = (int)$code % 4;
         } elseif ($len == 5) {
             $r = (3 * intval($code[0] . $code[2] . $code[4])) + (9 * intval($code[1] . $code[3]));
             $r %= 10;