1--TEST--
2ob_start(): Ensure unerasable buffer cannot be accessed or erased by ob_get_clean().
3--FILE--
4<?php
5function callback($string) {
6	static $callback_invocations;
7	$callback_invocations++;
8	return "[callback:$callback_invocations]$string\n";
9}
10
11ob_start('callback', 0, false);
12
13echo "This call will fail to obtain the content, since it is also requesting a clean:\n";
14$str = ob_get_clean();
15var_dump($str);
16?>
17--EXPECTF--
18[callback:1]This call will fail to obtain the content, since it is also requesting a clean:
19
20Notice: ob_get_clean(): failed to delete buffer callback in %s on line 11
21bool(false)
22