1--TEST--
2ob_start(): ensure buffers can't be added from within callback.
3--FILE--
4<?php
5
6/*
7 * proto bool ob_start([ string|array user_function [, int chunk_size [, bool erase]]])
8 * Function is implemented in main/output.c
9*/
10
11function f($str) {
12	ob_start();
13	echo "hello";
14	ob_end_flush();
15	return $str;
16}
17
18
19var_dump(ob_start('f'));
20echo "done";
21?>
22--EXPECTF--
23Fatal error: ob_start(): Cannot use output buffering in output buffering display handlers in %s on line 9