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                            交換數組第0項和第3項：

$v1 = $a\[0\];

$v2 = $a\[3\];

$t = $v1;

$v1 = $v2;

$v2 = $t;  //這種做法根本不行，因為v1，v2只是2個變量，跟數組沒有關系了！數組中的值并沒有交換

正確的做法是：

$t = $a\[0\];

$a\[0\] = $a\[3\];

$a\[3\] = $t;


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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