Replace strpos with str_starts_with (#247)

Author: dimitri-koenig

src/ArrayToXml.php

@@ -184,7 +184,7 @@ protected function convertElement(DOMElement $element, mixed $value): void
                     $this->addNumericNode($element, $data);
                 } elseif (str_starts_with($key, '__custom:')) {
                     $this->addNode($element, str_replace('\:', ':', preg_split('/(?<!\\\):/', $key)[1]), $data);
-                } elseif (strpos($key, '_comment') === 0 || strpos($key, '@comment') === 0) {
+                } elseif (str_starts_with($key, '_comment') || str_starts_with($key, '@comment')) {
                     $element->appendChild(new \DOMComment($data));
                 } else {
                     $this->addNode($element, $key, $data);