Minor Performance Improvements

src/PhpSpreadsheet/Writer/Xlsx.php

@@ -171,6 +171,7 @@ class Xlsx extends BaseWriter
         $this->numFmtHashTable = new HashTable();
         $this->styleHashTable = new HashTable();
         $this->stylesConditionalHashTable = new HashTable();
+        $this->determineUseDynamicArrays();
     }
 
     public function getWriterPartChart(): Chart
@@ -251,7 +252,7 @@ class Xlsx extends BaseWriter
     public function save($filename, int $flags = 0): void
     {
         $this->processFlags($flags);
-        $this->useDynamicArray = $this->preCalculateFormulas && Calculation::getInstance($this->spreadSheet)->getArrayReturnType() === Calculation::RETURN_ARRAY_AS_ARRAY && !$this->useCSEArrays;
+        $this->determineUseDynamicArrays();
 
         // garbage collect
         $this->pathNames = [];
@@ -282,9 +283,9 @@ class Xlsx extends BaseWriter
         $zipContent = [];
         // Add [Content_Types].xml to ZIP file
         $zipContent['[Content_Types].xml'] = $this->getWriterPartContentTypes()->writeContentTypes($this->spreadSheet, $this->includeCharts);
-        if ($this->useDynamicArrays()) {
-            $writerPartMetadata = new Xlsx\Metadata($this);
-            $zipContent['xl/metadata.xml'] = $writerPartMetadata->writeMetadata();
+        $metadataData = (new Xlsx\Metadata($this))->writeMetadata();
+        if ($metadataData !== '') {
+            $zipContent['xl/metadata.xml'] = $metadataData;
         }
 
         //if hasMacros, add the vbaProject.bin file, Certificate file(if exists)
@@ -721,13 +722,21 @@ class Xlsx extends BaseWriter
         return $this;
     }
 
-    public function setUseCSEArrays(bool $useCSEArrays): void
+    public function setUseCSEArrays(?bool $useCSEArrays): void
     {
-        $this->useCSEArrays = $useCSEArrays;
+        if ($useCSEArrays !== null) {
+            $this->useCSEArrays = $useCSEArrays;
+        }
+        $this->determineUseDynamicArrays();
     }
 
     public function useDynamicArrays(): bool
     {
         return $this->useDynamicArray;
     }
+
+    private function determineUseDynamicArrays(): void
+    {
+        $this->useDynamicArray = $this->preCalculateFormulas && Calculation::getInstance($this->spreadSheet)->getArrayReturnType() === Calculation::RETURN_ARRAY_AS_ARRAY && !$this->useCSEArrays;
+    }
 }

src/PhpSpreadsheet/Writer/Xlsx/Metadata.php

@@ -14,6 +14,9 @@ class Metadata extends WriterPart
      */
     public function writeMetadata(): string
     {
+        if (!$this->getParentWriter()->useDynamicArrays()) {
+            return '';
+        }
         // Create XML writer
         $objWriter = null;
         if ($this->getParentWriter()->getUseDiskCaching()) {

src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php

@@ -5,6 +5,7 @@ namespace PhpOffice\PhpSpreadsheet\Writer\Xlsx;
 use PhpOffice\PhpSpreadsheet\Calculation\Information\ErrorValue;
 use PhpOffice\PhpSpreadsheet\Cell\Cell;
 use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
+use PhpOffice\PhpSpreadsheet\Cell\DataType;
 use PhpOffice\PhpSpreadsheet\Reader\Xlsx\Namespaces;
 use PhpOffice\PhpSpreadsheet\RichText\RichText;
 use PhpOffice\PhpSpreadsheet\Settings;
@@ -30,6 +31,8 @@ class Worksheet extends WriterPart
 
     private bool $explicitStyle0;
 
+    private bool $useDynamicArrays = false;
+
     /**
      * Write worksheet to XML format.
      *
@@ -40,6 +43,7 @@ class Worksheet extends WriterPart
      */
     public function writeWorksheet(PhpspreadsheetWorksheet $worksheet, array $stringTable = [], bool $includeCharts = false): string
     {
+        $this->useDynamicArrays = $this->getParentWriter()->useDynamicArrays();
         $this->explicitStyle0 = $this->getParentWriter()->getExplicitStyle0();
         $this->numberStoredAsText = '';
         $this->formula = '';
@@ -1559,8 +1563,8 @@ class Worksheet extends WriterPart
         $objWriter->startElement('c');
         $objWriter->writeAttribute('r', $cellAddress);
         $mappedType = $pCell->getDataType();
-        if (strtolower($mappedType) === 'f') {
-            if ($this->getParentWriter()->useDynamicArrays()) {
+        if ($mappedType === DataType::TYPE_FORMULA) {
+            if ($this->useDynamicArrays) {
                 $tempCalc = $pCell->getCalculatedValue();
                 if (is_array($tempCalc)) {
                     $objWriter->writeAttribute('cm', '1');

tests/PhpSpreadsheetTests/Writer/Xlsx/ArrayFunctionsTest.php

@@ -339,4 +339,17 @@ class ArrayFunctionsTest extends TestCase
         }
         $spreadsheet2->disconnectWorksheets();
     }
+
+    public function testMetadataWritten(): void
+    {
+        Calculation::setArrayReturnType(Calculation::RETURN_ARRAY_AS_ARRAY);
+        $spreadsheet = new Spreadsheet();
+        $writer = new XlsxWriter($spreadsheet);
+        $writerMetadata = new XlsxWriter\Metadata($writer);
+        self::assertNotEquals('', $writerMetadata->writeMetaData());
+        $writer->setUseCSEArrays(true);
+        $writerMetadata2 = new XlsxWriter\Metadata($writer);
+        self::assertSame('', $writerMetadata2->writeMetaData());
+        $spreadsheet->disconnectWorksheets();
+    }
 }