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> empty測試：

0,"0","",null,false,[]都返回true
['0'],[0]返回false

> isset測試

值已經被定義，但是值不為null時返回真；值為null或沒有定義是返回假

> array_key_exists("name", $data)

在數組中有值，返回真
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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