Regression test

Closes phpstan/phpstan#10492

Author: ondrejmirtes

tests/PHPStan/Rules/Arrays/NonexistentOffsetInArrayDimFetchRuleTest.php

@@ -990,4 +990,14 @@ public function testBug4532(): void
 		]);
 	}
 
+	public function testBug10492(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-10492.php'], [
+			[
+				'Offset 2|4 might not exist on array{array{0}, array{1}, array{2}}.',
+				19,
+			],
+		]);
+	}
+
 }

tests/PHPStan/Rules/Arrays/data/bug-10492.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Bug10492;
+
+/**
+ * @return '02'|'04'
+ */
+function getIndex(int $input): string
+{
+	if ($input > 5) {
+		return '02';
+	}
+
+	return '04';
+}
+
+function (): void {
+	$arr = [0 => [0], 1 => [1], 2 => [2]];
+	echo print_r($arr[(int) getIndex(1)], true);
+};