Polishing Up

src/PhpSpreadsheet/Reader/Xlsx/Styles.php

@@ -266,7 +266,11 @@ class Styles extends BaseParserClass
             $alignment->setHorizontal($horizontal);
         }
         $justifyLastLine = (string) $this->getAttribute($alignmentXml, 'justifyLastLine');
-        $alignment->setJustifyLastLine(self::boolean($justifyLastLine));
+        if ($justifyLastLine !== '') {
+            $alignment->setJustifyLastLine(
+                self::boolean($justifyLastLine)
+            );
+        }
         $vertical = (string) $this->getAttribute($alignmentXml, 'vertical');
         if ($vertical !== '') {
             $alignment->setVertical($vertical);

src/PhpSpreadsheet/Style/Alignment.php

@@ -512,7 +512,7 @@ class Alignment extends Supervisor
 
         return md5(
             $this->horizontal
-            . $this->justifyLastLine
+            . (($this->justifyLastLine === null) ? 'null' : ($this->justifyLastLine ? 't' : 'f'))
             . $this->vertical
             . $this->textRotation
             . ($this->wrapText ? 't' : 'f')

src/PhpSpreadsheet/Writer/Xlsx/Style.php

@@ -457,8 +457,9 @@ class Style extends WriterPart
             if ($vertical !== '') {
                 $objWriter->writeAttribute('vertical', $vertical);
             }
-            if ($style->getAlignment()->getJustifyLastLine()) {
-                $objWriter->writeAttribute('justifyLastLine', '1');
+            $justifyLastLine = $style->getAlignment()->getJustifyLastLine();
+            if (is_bool($justifyLastLine)) {
+                $objWriter->writeAttribute('justifyLastLine', (string) (int) $justifyLastLine);
             }
 
             if ($style->getAlignment()->getTextRotation() >= 0) {

tests/PhpSpreadsheetTests/Reader/Xlsx/AlignmentTest.php

@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Style\Alignment;
+use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
+
+class AlignmentTest extends AbstractFunctional
+{
+    private ?Spreadsheet $spreadsheet = null;
+
+    private ?Spreadsheet $reloadedSpreadsheet = null;
+
+    protected function tearDown(): void
+    {
+        if ($this->spreadsheet !== null) {
+            $this->spreadsheet->disconnectWorksheets();
+            $this->spreadsheet = null;
+        }
+        if ($this->reloadedSpreadsheet !== null) {
+            $this->reloadedSpreadsheet->disconnectWorksheets();
+            $this->reloadedSpreadsheet = null;
+        }
+    }
+
+    public function testJustifyLastLine(): void
+    {
+        $this->spreadsheet = new Spreadsheet();
+        $sheet = $this->spreadsheet->getActiveSheet();
+        $sheet->setCellValue('A1', 'ABC');
+        $sheet->setCellValue('A2', 'DEF');
+        $sheet->setCellValue('A3', 'GHI');
+        $sheet->getStyle('A1')
+            ->getAlignment()
+            ->setHorizontal(Alignment::HORIZONTAL_DISTRIBUTED)
+            ->setJustifyLastLine(true);
+        $sheet->getStyle('A2')
+            ->getAlignment()
+            ->setHorizontal(Alignment::HORIZONTAL_DISTRIBUTED)
+            ->setJustifyLastLine(false);
+        $sheet->getStyle('A3')
+            ->getAlignment()
+            ->setHorizontal(Alignment::HORIZONTAL_DISTRIBUTED);
+        $this->reloadedSpreadsheet = $this->writeAndReload($this->spreadsheet, 'Xlsx');
+        $rsheet = $this->reloadedSpreadsheet->getActiveSheet();
+        self::assertTrue(
+            $rsheet->getStyle('A1')
+                ->getAlignment()
+                ->getJustifyLastLine()
+        );
+        self::assertFalse(
+            $rsheet->getStyle('A2')
+                ->getAlignment()
+                ->getJustifyLastLine()
+        );
+        self::assertNull(
+            $rsheet->getStyle('A3')
+                ->getAlignment()
+                ->getJustifyLastLine()
+        );
+    }
+}

tests/PhpSpreadsheetTests/Writer/Xlsx/Issue3443Test.php

@@ -37,7 +37,7 @@ class Issue3443Test extends AbstractFunctional
         $rsheet = $reloadedSpreadsheet->getActiveSheet();
         $expected1 = [
             'horizontal' => 'center',
-            'justifyLastLine' => false,
+            'justifyLastLine' => null,
             'indent' => 0,
             'readOrder' => 0,
             'shrinkToFit' => false,
@@ -79,7 +79,7 @@ class Issue3443Test extends AbstractFunctional
         $rsheet = $reloadedSpreadsheet->getActiveSheet();
         $expected1 = [
             'horizontal' => 'general',
-            'justifyLastLine' => false,
+            'justifyLastLine' => null,
             'indent' => 0,
             'readOrder' => 0,
             'shrinkToFit' => false,