ext/pdo: Add a test creating instances of Directory

This should not be possible, other opaque classes cannot be instantiated in practice as they do not have properties and prevent dynamic properties

ext/pdo/tests/pdo_fetch_class_opaque_object.phpt

@@ -0,0 +1,57 @@
+--TEST--
+PDO Common: Attempting to initialize an opaque object via PDO::FETCH_CLASS
+--EXTENSIONS--
+pdo
+--SKIPIF--
+<?php
+$dir = getenv('REDIR_TEST_DIR');
+if (false == $dir) die('skip no driver');
+require_once $dir . 'pdo_test.inc';
+PDOTest::skip();
+?>
+--FILE--
+<?php
+if (getenv('REDIR_TEST_DIR') === false) putenv('REDIR_TEST_DIR='.__DIR__ . '/../../pdo/tests/');
+require_once getenv('REDIR_TEST_DIR') . 'pdo_test.inc';
+$db = PDOTest::factory();
+
+$db->exec('CREATE TABLE pdo_fetch_class_opaque_object(id int NOT NULL PRIMARY KEY, path VARCHAR(10))');
+$db->exec("INSERT INTO pdo_fetch_class_opaque_object VALUES(1, 'AA')");
+$db->exec("INSERT INTO pdo_fetch_class_opaque_object VALUES(2, 'BB')");
+$db->exec("INSERT INTO pdo_fetch_class_opaque_object VALUES(3, 'CC')");
+
+$stmt = $db->prepare('SELECT path FROM pdo_fetch_class_opaque_object');
+$stmt->execute();
+
+var_dump($stmt->fetchAll(PDO::FETCH_CLASS, 'Directory', []));
+?>
+--CLEAN--
+<?php
+require_once getenv('REDIR_TEST_DIR') . 'pdo_test.inc';
+$db = PDOTest::factory();
+PDOTest::dropTableIfExists($db, "pdo_fetch_class_opaque_object");
+?>
+--EXPECTF--
+array(3) {
+  [0]=>
+  object(Directory)#%s (1) {
+    ["path"]=>
+    string(2) "AA"
+    ["handle"]=>
+    uninitialized(mixed)
+  }
+  [1]=>
+  object(Directory)#%s (1) {
+    ["path"]=>
+    string(2) "BB"
+    ["handle"]=>
+    uninitialized(mixed)
+  }
+  [2]=>
+  object(Directory)#%s (1) {
+    ["path"]=>
+    string(2) "CC"
+    ["handle"]=>
+    uninitialized(mixed)
+  }
+}