Add PHPT test for Rule A probe using mysqli_driver

mysqli_driver is a final internal class with a C-level create_object handler
and no __serialize/__unserialize/__sleep/__wakeup. It is available in every
standard PHP installation (bundled extension) so no external package is
needed. The test verifies that object_init_ex() succeeds for such classes
and that properties are preserved through the round-trip.

Also add mysqli to the CI extension list so the test runs rather than being
skipped.

Author: GromNaN

.github/workflows/test.yml

@@ -36,7 +36,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
-          extensions: mongodb
+          extensions: mongodb, mysqli
           coverage: none
           tools: none
         env:
@@ -79,7 +79,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: '8.4'
-          extensions: mongodb
+          extensions: mongodb, mysqli
           coverage: none
           tools: none
 
@@ -170,7 +170,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
-          extensions: mongodb
+          extensions: mongodb, mysqli
           coverage: none
           tools: none
 

tests/deepclone_rule_a_probe.phpt

@@ -0,0 +1,27 @@
+--TEST--
+Rule A: final internal classes with create_object but no serialization API round-trip via probe
+--EXTENSIONS--
+deepclone
+mysqli
+--FILE--
+<?php
+
+// mysqli_driver is a final internal class with a C-level create_object handler
+// and no __serialize/__unserialize/__sleep/__wakeup.
+
+$driver = new mysqli_driver();
+$driver->report_mode = MYSQLI_REPORT_ALL;
+
+$clone = deepclone_from_array(deepclone_to_array($driver));
+
+var_dump($clone instanceof mysqli_driver);
+var_dump($clone !== $driver);
+var_dump($clone->report_mode === $driver->report_mode);
+
+echo "Done\n";
+?>
+--EXPECT--
+bool(true)
+bool(true)
+bool(true)
+Done