Regression test

Closes phpstan/phpstan#10438

Author: ondrejmirtes

tests/PHPStan/Analyser/nsrt/bug-10438.php

@@ -0,0 +1,34 @@
+<?php declare(strict_types = 1);
+
+namespace Bug10438;
+
+use SimpleXMLElement;
+use function PHPStan\Testing\assertType;
+
+class HelloWorld
+{
+/**
+ * @return array<string, string|string[]>
+ */
+public function extract(SimpleXMLElement $data, string $type = 'Meta'): array
+{
+$keyName = ucfirst($type) . 'Type';
+$valueName = ucfirst($type) . 'Values';
+$meta = [];
+foreach ($data as $tag) {
+$key = (string)$tag->{$keyName};
+if ($tag->{$valueName}->count() == 1) {
+$meta[$key] = (string)$tag->{$valueName};
+continue;
+}
+assertType('array<string, list<string>|string>', $meta);
+$meta[$key] = [];
+assertType('array{}', $meta[$key]);
+foreach ($tag->{$valueName} as $value) {
+assertType('list<string>', $meta[$key]);
+$meta[$key][] = (string)$value;
+}
+}
+return $meta;
+}
+}