Fixed the test because libmysql results type is string. (#16709)

closes #16709

Author: SakiTakamachi

ext/pdo_mysql/tests/gh16314.phpt

@@ -11,52 +11,57 @@ MySQLPDOTest::skip();
 <?php
 require_once __DIR__ . '/inc/mysql_pdo_test.inc';
 
-$pdo = MySQLPDOTest::factory(Pdo\Mysql::class, null, [PDO::ATTR_PERSISTENT => true], false);
+$attr = [
+    PDO::ATTR_PERSISTENT => true,
+    PDO::ATTR_STRINGIFY_FETCHES => true,
+];
+
+$pdo = MySQLPDOTest::factory(Pdo\Mysql::class, null, $attr, false);
 var_dump($pdo->query('SELECT 1;')->fetchAll());
 
-$pdo = MySQLPDOTest::factory(Pdo\Mysql::class, null, [PDO::ATTR_PERSISTENT => true], true);
+$pdo = MySQLPDOTest::factory(Pdo\Mysql::class, null, $attr, true);
 var_dump($pdo->query('SELECT 1;')->fetchAll());
 
-$pdo = MySQLPDOTest::factory(Pdo::class, null, [PDO::ATTR_PERSISTENT => true], false);
+$pdo = MySQLPDOTest::factory(Pdo::class, null, $attr, false);
 var_dump($pdo->query('SELECT 1;')->fetchAll());
 
-$pdo = MySQLPDOTest::factory(Pdo::class, null, [PDO::ATTR_PERSISTENT => true], true);
+$pdo = MySQLPDOTest::factory(Pdo::class, null, $attr, true);
 var_dump($pdo->query('SELECT 1;')->fetchAll());
 ?>
 --EXPECT--
 array(1) {
   [0]=>
   array(2) {
     [1]=>
-    int(1)
+    string(1) "1"
     [0]=>
-    int(1)
+    string(1) "1"
   }
 }
 array(1) {
   [0]=>
   array(2) {
     [1]=>
-    int(1)
+    string(1) "1"
     [0]=>
-    int(1)
+    string(1) "1"
   }
 }
 array(1) {
   [0]=>
   array(2) {
     [1]=>
-    int(1)
+    string(1) "1"
     [0]=>
-    int(1)
+    string(1) "1"
   }
 }
 array(1) {
   [0]=>
   array(2) {
     [1]=>
-    int(1)
+    string(1) "1"
     [0]=>
-    int(1)
+    string(1) "1"
   }
 }