With PHP 5.4.41 and memcached 1.4.24 it works in ASCII mode as well.
(PECL memcached >= 2.0.0)
Memcached::touch — Set a new expiration on an item
$key, int $expiration = 0): boolMemcached::touch() sets a new expiration value on the given key.
成功时返回 true， 或者在失败时返回 false。
如需要则使用 Memcached::getResultCode()。
This is only supported when binary protocol is enabled.
$obj = new Memcached();
$obj->setOption(\Memcached::OPT_BINARY_PROTOCOL, true);