Check $strictNullComparison outside of loops

Might be considered a micro-optimization, but for large sheets, it could make a difference in performance. Only check the `$strictNullComparison` condition once, not for every single cell loop.

Author: ConnectGrid

src/PhpSpreadsheet/Worksheet/Worksheet.php

@@ -3148,25 +3148,32 @@ public function fromArray(array $source, mixed $nullValue = null, $startCell = '
         [$startColumn, $startRow] = Coordinate::coordinateFromString($startCell);
 
         // Loop through $source
-        foreach ($source as $rowData) {
-            $currentColumn = $startColumn;
-            foreach ($rowData as $cellValue) {
-                if ($strictNullComparison) {
+        if ($strictNullComparison) {
+            foreach ($source as $rowData) {
+                $currentColumn = $startColumn;
+                foreach ($rowData as $cellValue) {
                     if ($cellValue !== $nullValue) {
                         // Set cell value
                         $this->getCell($currentColumn . $startRow)->setValue($cellValue);
                     }
-                } else {
+                    ++$currentColumn;
+                }
+                ++$startRow;
+            }
+        } else {
+            foreach ($source as $rowData) {
+                $currentColumn = $startColumn;
+                foreach ($rowData as $cellValue) {
                     if ($cellValue != $nullValue) {
                         // Set cell value
                         $this->getCell($currentColumn . $startRow)->setValue($cellValue);
                     }
+                    ++$currentColumn;
                 }
-                ++$currentColumn;
+                ++$startRow;
             }
-            ++$startRow;
         }
-
+        
         return $this;
     }