32-bit Unit Test Warnings (#3232)

* 32-bit Unit Test Warnings

Some new problems exposed with latest Php8.1.

* Update BitWise.php

src/PhpSpreadsheet/Calculation/Database/DatabaseAbstract.php

@@ -34,7 +34,7 @@ abstract class DatabaseAbstract
      */
     protected static function fieldExtract(array $database, $field): ?int
     {
-        $field = strtoupper(Functions::flattenSingleValue($field ?? ''));
+        $field = strtoupper(Functions::flattenSingleValue($field) ?? '');
         if ($field === '') {
             return null;
         }

src/PhpSpreadsheet/Calculation/Engineering/BitWise.php

@@ -17,10 +17,12 @@ class BitWise
      * Split a number into upper and lower portions for full 32-bit support.
      *
      * @param float|int $number
+     *
+     * @return int[]
      */
     private static function splitNumber($number): array
     {
-        return [floor($number / self::SPLIT_DIVISOR), fmod($number, self::SPLIT_DIVISOR)];
+        return [(int) floor($number / self::SPLIT_DIVISOR), (int) fmod($number, self::SPLIT_DIVISOR)];
     }
 
     /**
@@ -55,7 +57,6 @@ class BitWise
         $split1 = self::splitNumber($number1);
         $split2 = self::splitNumber($number2);
 
-        // Scrutinizer does not like bitwise, and doesn't let you override its warning
         return  self::SPLIT_DIVISOR * ($split1[0] & $split2[0]) + ($split1[1] & $split2[1]);
     }
 
@@ -92,7 +93,6 @@ class BitWise
         $split1 = self::splitNumber($number1);
         $split2 = self::splitNumber($number2);
 
-        // Scrutinizer does not like bitwise, and doesn't let you override its warning
         return  self::SPLIT_DIVISOR * ($split1[0] | $split2[0]) + ($split1[1] | $split2[1]);
     }
 

src/PhpSpreadsheet/Worksheet/Validations.php

@@ -23,7 +23,7 @@ class Validations
 //                throw new Exception('Reference is not for this worksheet');
 //            }
 
-            return empty($worksheet) ? strtoupper($address) : $worksheet . '!' . strtoupper($address);
+            return empty($worksheet) ? strtoupper("$address") : $worksheet . '!' . strtoupper("$address");
         }
 
         if (is_array($cellAddress)) {