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# SISMEMBER

**SISMEMBER key member**

判斷 `member` 元素是否集合 `key` 的成員。

**可用版本：**

&gt;= 1.0.0

**時間復雜度:**

O(1)

**返回值:**

如果 `member` 元素是集合的成員，返回 `1` 。如果 `member` 元素不是集合的成員，或 `key` 不存在，返回 `0` 。

```
redis> SMEMBERS joe's_movies
1) "hi, lady"
2) "Fast Five"
3) "2012"

redis> SISMEMBER joe's_movies "bet man"
(integer) 0

redis> SISMEMBER joe's_movies "Fast Five"
(integer) 1

```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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