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                            **一.substr使用**

~~~
$s=substr('A云知夢在線平臺', 0, 3);

#超出:

$s=substr('A云知夢在線平臺', 50, 3);

~~~

  
**二.mb\_substr使用**

~~~
$s=mb_substr('B云知夢在線平臺', 0, 3);

#超出:

$s=mb_substr('A云知夢在線平臺', 50, 3);

~~~

  
**三.iconv\_substr使用**

~~~
$s=iconv_substr('C云知夢在線平臺', 0, 3);

#超出:
$s=iconv_substr('A云知夢在線平臺', 50, 3);

~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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