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                            final關鍵字用于修飾類和方法。
如果父類中的方法聲明了final，則子類無法對其覆蓋；如果父類聲明了final，則不能被繼承。
```
//父類：
final class  BaseClass {
   public function test() {
       echo "use test\n";
   }

   final public function moreTesting() {
       echo "use moreTesting\n";
   }
}
//子類繼承父類：
class ChildClass extends BaseClass {
   public function moreTesting() {
       echo "use moreTesting1111111\n";
   }
}
//運行結果報錯
PHP Fatal error: Cannot override final method BaseClass::moreTesting()
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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