PHP7 Memcached CAS 变化
服务器升级PHP7后发现一些Memcached的get和getMulti方法的Warning，查阅了一下官方文档，原来PHP7中Memcached扩展的CAS实现有所变化：
As of some version of php7 (i was not able to determine which exactly).
The $cas_token is no longer valid argument. It has been removed in favor of flags argument, as it appears to be causing issues when subclassing the Memcached class.
See https://github.com/php-memcached-dev/php-memcached/pull/214 for more details.
Basically you need to
<?php
function memcacheGet($key, $cb = null, &$cas = null) {
$m = memcacheGetObject();
if(empty($m))
return false;
if(defined('Memcached::GET_EXTENDED')) {
//Incompatible change in php7, took me 2 hours to figure this out, grrr
$_o = $m->get($key, $cb, Memcached::GET_EXTENDED);
$o = $_o['value'];
$cas = $_o['cas'];
} else {
$o = $m->get($key, $cb, $cas);
}
return $o;
}
?>
PHP7中用Memcached::GET_EXTENDED参数表示获取cas，token不再以引用方式获取而是直接返回，getMulti也是一样。
