Add minimal XLSX export support

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php-versions }}
-          extensions: sockets, json, curl
+          extensions: sockets, json, curl, zip
 
       - name: Install dependencies with composer
         run: composer install

.mddoc.xml.dist

@@ -13,6 +13,7 @@ A Streamed Data Export Tool
 Supported formats:
 - CSV / TSV
 - SpreadsheetML "Excel 2004 XML Spreadsheet"
+- XLSX "Office Open XML Spreadsheet"
 - More to come.
 
 ]]></text>

README.md

@@ -11,6 +11,7 @@ A Streamed Data Export Tool
 Supported formats:
 - CSV / TSV
 - SpreadsheetML "Excel 2004 XML Spreadsheet"
+- XLSX "Office Open XML Spreadsheet"
 - More to come.
 
 
@@ -375,10 +376,29 @@ function setCreatedTime(?int $createdTime) : void
 
 - ***int*** | ***null*** `$createdTime` - The timestamp to use for the created time. If null, the current time will be used.
 
+### Class: \Quorum\Exporter\Engines\XlsxEngine
+
+Writes a minimal Office Open XML spreadsheet (XLSX) archive.
+
+This intentionally mirrors SpreadsheetMLEngine: values are either numbers or
+strings, empty values leave gaps in their rows, and multiline strings wrap.
+
+---
+
+#### Method: XlsxEngine->setCreatedTime
+
+```php
+function setCreatedTime(?int $createdTime) : void
+```
+
+##### Parameters:
+
+- ***int*** | ***null*** `$createdTime` - The timestamp to use for the created time. If null, the current time will be used.
+
 ### Class: \Quorum\Exporter\Exceptions\ExportException
 
 ### Class: \Quorum\Exporter\Exceptions\InvalidDataTypeException
 
 ### Class: \Quorum\Exporter\Exceptions\OutputException
 
-### Class: \Quorum\Exporter\Exceptions\WritableException
+### Class: \Quorum\Exporter\Exceptions\WritableException

composer.json

@@ -10,6 +10,7 @@
 		"php": ">=7.4"
 	},
 	"require-dev": {
+		"ext-zip": "*",
 		"donatj/drop": "*",
 		"phpunit/phpunit": "4.* | ~8.5 | ^9.0",
 		"friendsofphp/php-cs-fixer": "^3.16",