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Memcache::get – »ñȡһ¸ökeyÖµ
Memcache::getExtendedStats – »ñÈ¡½ø³Ì³ØÖÐËùÓнø³ÌµÄÔËÐÐϵͳͳ¼Æ
Memcache::getServerStatus – »ñÈ¡ÔËÐзþÎñÆ÷µÄ²ÎÊý
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