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                            ## 時間日期有效性驗證
> is_datetime($datetime,$format='Y-m-d H:i:s')

傳入日期和制定規則匹配則返回`true`，反之`false`。

| 參數 | 類型 | 必須 | 說明 |
| --- | --- | --- | --- |
| `$datetime` | string | 是 | 待判斷時間日期 |
| `$format` | string | 否 | 判斷規則，默認Y-m-d H:i:s |

> 示例：
~~~
var_dump(is_datetime('2020-11-11 00:00:00','Y-m-d H:i:s'));    // true
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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