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                            在程序中避免下面例子中的嵌入式賦值：  

錯誤示范：
~~~
$str="HI";
foreach ($list as $k =>$v)
{
    //轉小寫作對比
    if (strtolower($str) == $v['hi']) {
        //邏輯
    }
}
~~~

正確示范：
~~~
$str        = "HI";
$str_lower  = strtolower($str);
foreach ($list as $k =>$v)
{
    //轉小寫作對比
    if ($str_lower == $v['hi']) {
        //邏輯
    }
}
~~~

strtolower() 不能放在循環里面，有損性能，每次都要去轉換，類似這樣的場景需要注意！


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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