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                            ## 給數組所有key或指定key增加前綴
> array_key_prefix(&$arr = [], String $prefix,String $key='')

給數組指定的key鍵名加上前綴，沒有指定key時，將給數組所有鍵名加上前綴。

| 參數 | 類型 | 必須 | 說明 |
| --- | --- | --- | --- |
| `$arr ` | array | 是 | 待插入數組 |
| `$prefix ` | string | 是 | 需要加上的前綴 |
| `$key` | string | 否 | 指定key |

> 示例：
~~~
$arr=['qwe'=>123,'asd'=>234];
var_dump(array_key_prefix($arr,‘test_’));    // ['test_qwe'=>123,'test_asd'=>234]
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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