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                            函數的目的：減少重復代碼
標準函數：系統自帶函數，只需要傳參數就可以

很多函數可以單獨放在一個文件夾：library
tool.library.php   //用來存放所有函數
通過require調用

__FILE__包含文件，速度更快
~~~
require dirname(__FILE__).'\a.txt';
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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