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                             ## sCard, sSize



##### *Description*

Returns the cardinality of the set identified by key.

返回SET容器的成員數

##### *Parameters*

*key*

##### *Return value*

*LONG* the cardinality of the set identified by key, 0 if the set doesn't exist.

##### *Example*

```
<pre class="calibre9">$redis->sAdd('key1' , 'member1');
$redis->sAdd('key1' , 'member2');
$redis->sAdd('key1' , 'member3'); /* 'key1' => {'member1', 'member2', 'member3'}*/
$redis->sCard('key1'); /* 3 */
$redis->sCard('keyX'); /* 0 */
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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