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--TEST--
ob_start(): Ensure unerasable buffer cannot be accessed or erased by ob_get_clean().
--FILE--
<?php
function callback($string) {
static $callback_invocations;
$callback_invocations++;
return "[callback:$callback_invocations]$string\n";
}
ob_start('callback', 0, false);
echo "This call will obtain the content, but will not clean the buffer.";
$str = ob_get_clean();
var_dump($str);
?>
--EXPECTF--
[callback:1]This call will obtain the content, but will not clean the buffer.
Notice: ob_get_clean(): Failed to discard buffer of callback (0) in %s on line 11
Notice: ob_get_clean(): Failed to delete buffer of callback (0) in %s on line 11
string(65) "This call will obtain the content, but will not clean the buffer."
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