有时候在使用缓存的时候，可能需要获取memcache中缓存的总数或key列表！
/**
* 返回key列表
* @return type
*/
function getMemcacheKeys() {
$memcache = new Memcache;
$memcache->connect('127.0.0.1', 11211) or die("Could not connect to memcache server");
$list = array();
$i = 0;
$allSlabs = $memcache->getExtendedStats('slabs');
$items = $memcache->getExtendedStats('items');
foreach ($allSlabs as $server => $slabs) {
foreach ($slabs AS $slabId => $slabMeta) {
$cdump = $memcache->getExtendedStats('cachedump', (int) $slabId);
foreach ($cdump AS $keys => $arrVal) {
foreach ($arrVal AS $k => $v) {
$list[$i] = $k;
$i++;
}
}
}
}
return $list;
}
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