Using htmlspecialchars to fix issue PHPOffice#3145: this prevents the…

… SimpleXMLElement error "unterminated entity reference" when HTML entities are present in a worksheet

src/PhpSpreadsheet/Reader/Xlsx.php

@@ -940,7 +940,7 @@ protected function loadSpreadsheetFromFile(string $filename): Spreadsheet
                                     }
                                     $node->addAttribute('sqref', $item->children(Namespaces::DATA_VALIDATIONS2)->sqref);
                                     if (isset($item->formula1)) {
-                                        $node->addChild('formula1', $item->formula1->children(Namespaces::DATA_VALIDATIONS2)->f);
+                                        $node->addChild('formula1', htmlspecialchars($item->formula1->children(Namespaces::DATA_VALIDATIONS2)->f));
                                     }
                                 }
                             }

tests/PhpSpreadsheetTests/Reader/Xlsx/Issue3145Test.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PHPUnit\Framework\TestCase;
+
+class Issue3145Test extends TestCase
+{
+    public function testIssue3145(): void
+    {
+        $filename = 'tests/data/Reader/XLSX/issue.3145.xlsx';
+        $reader = IOFactory::createReader('Xlsx');
+        $spreadsheet = $reader->load($filename);
+        $sheet = $spreadsheet->getActiveSheet();
+
+        self::assertEquals('Headline A', $sheet->getCell('A1')->getValue());
+        self::assertEquals('Configdential B', $sheet->getCell('A2')->getValue());
+    }
+}