fix:更新已知bug,优化代码

vendor/endroid/qr-code/src/Writer/Result/SvgResult.php

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Endroid\QrCode\Writer\Result;
+
+use Endroid\QrCode\Matrix\MatrixInterface;
+
+final class SvgResult extends AbstractResult
+{
+    private \SimpleXMLElement $xml;
+    private bool $excludeXmlDeclaration;
+
+    public function __construct(
+        MatrixInterface $matrix,
+        \SimpleXMLElement $xml,
+        bool $excludeXmlDeclaration = false
+    ) {
+        parent::__construct($matrix);
+
+        $this->xml = $xml;
+        $this->excludeXmlDeclaration = $excludeXmlDeclaration;
+    }
+
+    public function getXml(): \SimpleXMLElement
+    {
+        return $this->xml;
+    }
+
+    public function getString(): string
+    {
+        $string = $this->xml->asXML();
+
+        if (!is_string($string)) {
+            throw new \Exception('Could not save SVG XML to string');
+        }
+
+        if ($this->excludeXmlDeclaration) {
+            $string = str_replace("<?xml version=\"1.0\"?>\n", '', $string);
+        }
+
+        return $string;
+    }
+
+    public function getMimeType(): string
+    {
+        return 'image/svg+xml';
+    }
+}