Invert Union and Intersection Between Excel and Xml

I don't know why MS did this. We're stuck with it.

src/PhpSpreadsheet/Reader/Xlsx/ConditionalStyles.php

@@ -188,7 +188,9 @@ class ConditionalStyles
             $conditionalStyles = $this->readStyleRules($cfRules, $xmlExtLst);
 
             // Extract all cell references in $cellRangeReference
-            $cellRangeReference = str_replace('$', '', strtoupper($cellRangeReference));
+            // N.B. In Excel UI, intersection is space and union is comma.
+            // But in Xml, intersection is comma and union is space.
+            $cellRangeReference = str_replace(['$', ' ', ',', '^'], ['', '^', ' ', ','], strtoupper($cellRangeReference));
             $worksheet->getStyle($cellRangeReference)->setConditionalStyles($conditionalStyles);
         }
     }

src/PhpSpreadsheet/Style/ConditionalFormatting/CellMatcher.php

@@ -60,7 +60,6 @@ class CellMatcher
 
     protected function setReferenceCellForExpressions(string $conditionalRange): void
     {
-        $conditionalRange = str_replace(' ', ',', $conditionalRange);
         $conditionalRange = Coordinate::splitRange(str_replace('$', '', strtoupper($conditionalRange)));
         [$this->referenceCell] = $conditionalRange[0];
 

src/PhpSpreadsheet/Worksheet/Worksheet.php

@@ -1422,7 +1422,7 @@ class Worksheet implements IComparable
 
         $cell = $this->getCell($coordinate);
         foreach (array_keys($this->conditionalStylesCollection) as $conditionalRange) {
-            $cellBlocks = explode(' ', $conditionalRange);
+            $cellBlocks = explode(',', $conditionalRange);
             foreach ($cellBlocks as $cellBlock) {
                 if ($cell->isInRange($cellBlock)) {
                     return $this->conditionalStylesCollection[$conditionalRange];
@@ -1438,7 +1438,7 @@ class Worksheet implements IComparable
         $coordinate = strtoupper($coordinate);
         $cell = $this->getCell($coordinate);
         foreach (array_keys($this->conditionalStylesCollection) as $conditionalRange) {
-            $cellBlocks = explode(' ', $conditionalRange);
+            $cellBlocks = explode(',', $conditionalRange);
             foreach ($cellBlocks as $cellBlock) {
                 if ($cell->isInRange($cellBlock)) {
                     return $conditionalRange;
@@ -1507,7 +1507,7 @@ class Worksheet implements IComparable
      */
     public function setConditionalStyles(string $coordinate, array $styles): static
     {
-        $this->conditionalStylesCollection[trim(strtoupper($coordinate))] = $styles;
+        $this->conditionalStylesCollection[strtoupper($coordinate)] = $styles;
 
         return $this;
     }

src/PhpSpreadsheet/Writer/Xls/Worksheet.php

@@ -492,7 +492,13 @@ class Worksheet extends BIFFwriter
     {
         $conditionalFormulaHelper = new ConditionalHelper($this->parser);
 
-        $arrConditionalStyles = $this->phpSheet->getConditionalStylesCollection();
+        $arrConditionalStyles = [];
+        foreach ($this->phpSheet->getConditionalStylesCollection() as $key => $value) {
+            $keyExplode = explode(',', $key);
+            foreach ($keyExplode as $exploded) {
+                $arrConditionalStyles[$exploded] = $value;
+            }
+        }
         if (!empty($arrConditionalStyles)) {
             // Write ConditionalFormattingTable records
             foreach ($arrConditionalStyles as $cellCoordinate => $conditionalStyles) {

src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php

@@ -815,7 +815,9 @@ class Worksheet extends WriterPart
         // Loop through styles in the current worksheet
         foreach ($worksheet->getConditionalStylesCollection() as $cellCoordinate => $conditionalStyles) {
             $objWriter->startElement('conditionalFormatting');
-            $objWriter->writeAttribute('sqref', $cellCoordinate);
+            // N.B. In Excel UI, intersection is space and union is comma.
+            // But in Xml, intersection is comma and union is space.
+            $objWriter->writeAttribute('sqref', str_replace(['$', ' ', ',', '^'], ['', '^', ' ', ','], $cellCoordinate));
 
             foreach ($conditionalStyles as $conditional) {
                 // WHY was this again?

tests/PhpSpreadsheetTests/Reader/Xlsx/Issue4039Test.php

@@ -16,7 +16,7 @@ class Issue4039Test extends \PHPUnit\Framework\TestCase
         $spreadsheet = $reader->load(self::$testbook);
         $sheet = $spreadsheet->getSheetByNameOrThrow('cellIs Expression');
         $expected = [
-            'A12:D17 A20', // split range
+            'A12:D17,A20', // split range
             'A22:D27',
             'A2:E6',
         ];

tests/PhpSpreadsheetTests/Writer/Xls/ConditionalUnionTest.php

@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Writer\Xls;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Style\Conditional;
+use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
+
+class ConditionalUnionTest extends AbstractFunctional
+{
+    public function testConditionalUnion(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $sheet = $spreadsheet->getActiveSheet();
+        $sheet->fromArray([
+            [1, 2, 3, 4, 5],
+            [2, 3, 4, 5, 6],
+            [3, 4, 5, 6, 7],
+        ]);
+        $condition1 = new Conditional();
+        $condition1->setConditionType(Conditional::CONDITION_CELLIS);
+        $condition1->setOperatorType(Conditional::OPERATOR_BETWEEN);
+        $condition1->setConditions([2, 4]);
+        $condition1->getStyle()->getFont()
+            ->setBold(true);
+        $conditionalStyles = [$condition1];
+        $sheet->setConditionalStyles('A1:A3,C1:E3', $conditionalStyles);
+
+        $robj = $this->writeAndReload($spreadsheet, 'Xls');
+        $spreadsheet->disconnectWorksheets();
+        $sheet0 = $robj->getActiveSheet();
+        $conditionals = $sheet0->getConditionalStylesCollection();
+        self::assertSame(['A1:A3', 'C1:E3'], array_keys($conditionals));
+        $cond1 = $conditionals['A1:A3'][0];
+        self::assertSame(Conditional::CONDITION_CELLIS, $cond1->getConditionType());
+        self::assertSame(Conditional::OPERATOR_BETWEEN, $cond1->getOperatorType());
+        self::assertSame([2, 4], $cond1->getConditions());
+        $font1 = $cond1->getStyle()->getFont();
+        self::assertTrue($font1->getBold());
+
+        $cond2 = $conditionals['C1:E3'][0];
+        self::assertSame(Conditional::CONDITION_CELLIS, $cond2->getConditionType());
+        self::assertSame(Conditional::OPERATOR_BETWEEN, $cond2->getOperatorType());
+        self::assertSame([2, 4], $cond2->getConditions());
+        $font2 = $cond2->getStyle()->getFont();
+        self::assertTrue($font2->getBold());
+        $robj->disconnectWorksheets();
+    }
+}