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                             ## setnx



##### Description

Set the string value in argument as value of the key if the key doesn't already exist in the database.

setnx用于設置一個KEY-VALUE，這個函數會先判斷Redis中是否有這個KEY，如果沒有就SET，有就返回False。

##### Parameters

*key* *value*

##### Return value

*Bool*`<span class="calibre12">TRUE</span>` in case of success, `<span class="calibre12">FALSE</span>` in case of failure.

##### Examples

```
<pre class="calibre9">$redis->setnx('key', 'value'); /* return TRUE */
$redis->setnx('key', 'value'); /* return FALSE */
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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