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                            只要理解一個核心的觀念：
就是將等號（=）右邊的數據（可能是運算結果數據）賦值給左邊的變量。
看看以下寫法：
```
$v1 = 1;
$v2 = 2;
$v3 = $v1 + $v2;
$v1 + $v2 = $v3;	//可以嗎？不可以！
if(  $v1 + $v2 = $v3 ){....}	//可以嗎？？？還是不可以！
```
> 一定記住，一個等號的左邊，只能是一個“變量名”！
```
所以，這個寫法是錯誤的：    $v1+2 = $v2 + 3
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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