Handle Empty String in SharedStrings

CHANGELOG.md

@@ -33,6 +33,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - Xls Conditional Format Improvements. [PR #4030](https://github.com/PHPOffice/PhpSpreadsheet/pull/4030) [PR #4033](https://github.com/PHPOffice/PhpSpreadsheet/pull/4033)
 - Conditional Range Unions and Intersections [Issue #4039](https://github.com/PHPOffice/PhpSpreadsheet/issues/4039) [PR #4042](https://github.com/PHPOffice/PhpSpreadsheet/pull/4042)
 - Csv Reader allow use of html mimetype. [Issue #4036](https://github.com/PHPOffice/PhpSpreadsheet/issues/4036) [PR #4049](https://github.com/PHPOffice/PhpSpreadsheet/pull/4040)
+- Empty String in sharedStrings. [Issue #4063](https://github.com/PHPOffice/PhpSpreadsheet/issues/4063) [PR #4064](https://github.com/PHPOffice/PhpSpreadsheet/pull/4064)
 
 ## 2024-05-11 - 2.1.0
 

src/PhpSpreadsheet/Reader/Xlsx.php

@@ -700,6 +700,8 @@ protected function loadSpreadsheetFromFile(string $filename): Spreadsheet
                                     $sharedStrings[] = StringHelper::controlCharacterOOXML2PHP((string) $val->t);
                                 } elseif (isset($val->r)) {
                                     $sharedStrings[] = $this->parseRichText($val);
+                                } else {
+                                    $sharedStrings[] = '';
                                 }
                             }
                         }

tests/PhpSpreadsheetTests/Reader/Xlsx/Issue4063Test.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PHPUnit\Framework\TestCase;
+
+class Issue4063Test extends TestCase
+{
+    private static string $testbook = 'tests/data/Reader/XLSX/issue.4063.xlsx';
+
+    public function testSharedStringsWithEmptyString(): void
+    {
+        $spreadsheet = IOFactory::load(self::$testbook);
+        $sheet = $spreadsheet->getActiveSheet();
+        $data = $sheet->toArray(null, true, true, true);
+        $nbsp = "\u{00a0}";
+        self::assertSame(['A' => '226', 'B' => '', 'C' => $nbsp], $data[17]);
+        self::assertSame(['A' => '38873', 'B' => 'gg', 'C' => ' '], $data[22]);
+        $spreadsheet->disconnectWorksheets();
+    }
+}