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;
+	}
+}