--TEST--
readline_clear_history(): Basic test
--SKIPIF--
<?php if (!extension_loaded("readline")) die("skip"); ?>
--FILE--
<?php

var_dump(readline_clear_history());
var_dump(readline_clear_history(1));

?>
--EXPECTF--
bool(true)

Warning: readline_clear_history() expects exactly 0 parameters, 1 given in %s on line %d
NULL