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--TEST--
Bug #46897: ob_flush() should fail to flush unerasable buffers
--FILE--
<?php
function callback($string) {
    static $callback_invocations;
    $callback_invocations++;
    return "[callback:$callback_invocations]$string\n";
}

ob_start('callback', 0, false);

echo "Attempt to flush unerasable buffer - should fail...";
var_dump(ob_flush());
// Check content of buffer after flush - if flush failed it should still contain the string above.
var_dump(ob_get_contents());
echo 'Done';
?>
--EXPECTF--
[callback:1]Attempt to flush unerasable buffer - should fail...
Notice: ob_flush(): failed to flush buffer callback. in %s on line %d
bool(false)
string(%d) "Attempt to flush unerasable buffer - should fail...
Notice: ob_flush(): failed to flush buffer callback. in %s on line %d
bool(false)
"
Done