ensure namespaces are not used after free

Author: withinboredom

Zend/zend.c

@@ -1226,13 +1226,13 @@ void zend_shutdown(void) /* {{{ */
 	zend_map_ptr_static_last = 0;
 	zend_map_ptr_static_size = 0;
 
-	zend_destroy_namespaces();
-
 	zend_destroy_rsrc_list_dtors();
 
 	zend_unload_modules();
 
 	zend_optimizer_shutdown();
+
+	zend_destroy_namespaces();
 	startup_done = false;
 }
 /* }}} */

Zend/zend_namespaces.c

@@ -119,4 +119,5 @@ void zend_destroy_namespaces(void) {
 	}
 
 	zend_hash_destroy(&namespaces);
+	global_namespace = NULL;
 }