Используем в качестве компонента для соединения с редисом библиотеку Predis

common/components/Redis/Set.php

@@ -0,0 +1,50 @@
+<?php
+namespace common\components\Redis;
+
+use ArrayIterator;
+use IteratorAggregate;
+use Yii;
+
+class Set extends Key implements IteratorAggregate {
+
+    /**
+     * @return Connection
+     */
+    public static function getDb() {
+        return Yii::$app->redis;
+    }
+
+    public function add($value) {
+        static::getDb()->sadd($this->key, $value);
+        return $this;
+    }
+
+    public function remove($value) {
+        static::getDb()->srem($this->key, $value);
+        return $this;
+    }
+
+    public function members() {
+        return static::getDb()->smembers($this->key);
+    }
+
+    public function getValue() {
+        return $this->members();
+    }
+
+    public function exists($value) {
+        return (bool)static::getDb()->sismember($this->key, $value);
+    }
+
+    public function diff(array $sets) {
+        return static::getDb()->sdiff([$this->key, implode(' ', $sets)]);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getIterator() {
+        return new ArrayIterator($this->members());
+    }
+
+}