Fix PDOStatement getIterator return type

Author: mbolli

stubs/PDOStatement.stub

@@ -19,4 +19,9 @@ class PDOStatement implements Traversable, IteratorAggregate
      * @return array{name: string, table?: string, native_type?: string, len: int, flags: array<int, string>, precision: int<0, max>, pdo_type: PDO::PARAM_* }|false
      */
     public function getColumnMeta(int $column) {}
+
+    /**
+     * @return Iterator
+     */
+    public function getIterator() {}
 }

tests/PHPStan/Analyser/nsrt/bug-8886.php

@@ -0,0 +1,13 @@
+<?php // lint >= 8.0
+
+namespace Bug8886;
+
+use PDO;
+use function PHPStan\Testing\assertType;
+
+function testPDOStatementGetIterator(): void {
+	$pdo = new PDO('sqlite::memory:');
+    $stmt = $pdo->query('SELECT 1');
+
+	assertType('Iterator', $stmt->getIterator());
+}