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                             ## decr, decrBy



##### Description

Decrement the number stored at key by one. If the second argument is filled, it will be used as the integer value of the decrement.

對指定的KEY的值自減1。如何填寫了第二個參數，將把第二個參數自減給KEY的值。##### Parameters

*key*
*value*: value that will be substracted to key (only for decrBy)

##### Return value

*INT* the new value

##### Examples

```
<pre class="calibre9">$redis->decr('key1'); /* key1 didn't exists, set to 0 before the increment */
                      /* and now has the value -1  */

$redis->decr('key1'); /* -2 */
$redis->decr('key1'); /* -3 */
$redis->decrBy('key1', 10); /* -13 */
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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