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                在社交網站中用戶都可以為自己設置的興趣標簽,后臺就可以給標記相同標簽的人互推好友,或者向某一批相同標簽的人發起活動。 ## 設置標簽 ~~~ public function setTags($user_id) { $redis = new \Redis(); $redis->connect('127.0.0.1', 6379); // 創建標簽 $redis->sAdd("u:t:{$user_id}", "php", "java"); // 以數組形式創建集合 // $redis->sAddArray("u:t:{$user_id}", ["php", "java"]); } ~~~ ## 兩個用戶的標簽交集 ~~~ public function getInter($user_id, $friends_id) { $redis = new \Redis(); $redis->connect('127.0.0.1', 6379); $inter = $redis->sInter("u:t:{$user_id}", "u:t:{$friends_id}"); var_dump($inter); } ~~~ 除了兩個用戶之間的共同興趣外,微博的共同關注功能正是 Redis 的集合數據結構交集實現的。
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