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                            **一.調用禁用函數或類**  
#php.ini  
1.在PHP 8之前，嘗試使用禁用的功能會導致警告.  
2.在PHP 8和更高版本中，嘗試使用禁用的功能將為未聲明的功能引發標準錯誤.

  
**二.function\_exists檢查**  
#禁用的功能直接返回false

~~~
if (!function_exists('substr')) {
    function substr() {}
}

~~~

  
**三.禁用的功能可以重新定義**

~~~
function substr(){}
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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