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                            ## exists


##### Description

Verify if the specified key exists.

驗證一個指定的KEY是否存在

##### Parameters

*key*

##### Return value

*BOOL*: If the key exists, return `<span class="calibre12">TRUE</span>`, otherwise return `<span class="calibre12">FALSE</span>`.

##### Examples

```
<pre class="calibre16">$redis->set('key', 'value');
$redis->exists('key'); /*  TRUE */
$redis->exists('NonExistingKey'); /* FALSE */
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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