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                            # PHP key() 函數



## 定義和用法

key() 函數返回數組內部指針當前指向元素的鍵名。

若失敗，則返回 FALSE。

該函數與 [current()](/php/func_array_current.asp "PHP current() 函數") 類似，只是返回的結果不同。current() 函數返回的是元素的值，而 key() 函數返回的是元素的鍵名。

### 語法

```
key(array)
```

| 參數 | 描述 |
| --- | --- |
| array | 必需。規定要使用的數組。 |

## 例子

```
<?php
$people = array("Peter", "Joe", "Glenn", "Cleveland");
echo "The key from the current position is: " . key($people);
?>
```

輸出：

```
The key from the current position is: 0
```




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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