Need to update toXml() method.

.gitignore

@@ -0,0 +1,6 @@
+/vendor
+composer.phar
+composer.lock
+.DS_Store
+notes
+.phpunit.result.cache

.travis.yml

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+language: php
+
+php:
+  - 7.2
+  - 7.3
+
+before_script:
+  - composer self-update
+  - composer install --no-interaction
+
+script: 
+  - vendor/bin/phpunit

composer.json

@@ -0,0 +1,43 @@
+{
+    "name": "soapbox/laravel-formatter",
+    "type": "library",
+    "description": "A formatting library that converts data output between XML, CSV, JSON, TXT, YAML and a few others.",
+    "keywords": ["laravel", "formatter", "data", "convert", "csv", "xml", "yaml"],
+    "homepage": "http://github.com/SoapBox/laravel-formatter",
+    "license": "MIT",
+    "version": "3.1.1",
+    "authors": [
+        {
+            "name": "Graham McCarthy",
+            "email": "[email protected]",
+            "homepage": "http://grahammccarthy.com"
+        },
+        {
+            "name": "Jaspaul Bola",
+            "email": "[email protected]",
+            "homepage": "http://jaspaulbola.com"
+        }
+    ],
+    "require": {
+        "php": "^7.2",
+        "league/csv": "~9.0",
+        "mustangostang/spyc": "~0.6",
+        "illuminate/support": "^6.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "~8.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "SoapBox\\Formatter\\": "src/"
+        }
+    },
+    "extra": {
+        "laravel": {
+            "aliases": {
+                "Formatter": "SoapBox\\Formatter"
+            }
+        }
+    },
+    "minimum-stability": "stable"
+}