Make zval2myslqnd implementations aware of inheritance

Author: johannes

ext/mysqli/mysqli.c

@@ -531,7 +531,7 @@ PHP_MYSQLI_EXPORT(zend_object_value) mysqli_objects_new(zend_class_entry *class_
 #include "ext/mysqlnd/mysqlnd_reverse_api.h"
 static MYSQLND *mysqli_convert_zv_to_mysqlnd(zval * zv TSRMLS_DC)
 {
-	if (Z_TYPE_P(zv) == IS_OBJECT && Z_OBJCE_P(zv) == mysqli_link_class_entry) {
+	if (Z_TYPE_P(zv) == IS_OBJECT && instanceof_function(Z_OBJCE_P(zv), mysqli_link_class_entry) TSRMLS_CC) {
 		MY_MYSQL * mysql;
 		MYSQLI_RESOURCE  * my_res;
 		mysqli_object * intern = (mysqli_object *)zend_object_store_get_object(zv TSRMLS_CC);

ext/pdo_mysql/pdo_mysql.c

@@ -61,7 +61,7 @@ ZEND_DECLARE_MODULE_GLOBALS(pdo_mysql)
 #include "ext/mysqlnd/mysqlnd_reverse_api.h"
 static MYSQLND * pdo_mysql_convert_zv_to_mysqlnd(zval * zv TSRMLS_DC)
 {
-	if (Z_TYPE_P(zv) == IS_OBJECT && Z_OBJCE_P(zv) == php_pdo_get_dbh_ce()) {
+	if (Z_TYPE_P(zv) == IS_OBJECT && instanceof_function(Z_OBJCE_P(zv), php_pdo_get_dbh_ce() TSRMLS_CC)) {
 		pdo_dbh_t * dbh = zend_object_store_get_object(zv TSRMLS_CC);
 
 		if (!dbh || dbh->driver != &pdo_mysql_driver) {