爲什麼變量不傳遞給查詢？

Question

我有PHP代碼從下拉菜單中獲取值並在查詢中使用它們。但是他們被忽略了。這裏有一個例子：

$sortIn = $_POST['SortIn']; 
    $sortBy = $_POST['SortBy']; 

    $myquery = 'SELECT something FROM somewhere ORDER BY "$sortBy" "$sortIn"' ; 

然而，查詢的執行過程$myquery = 'SELECT something FROM somewhere'

Answer 1

更改爲：由於在單引號$sortBy和$sortIn犯規解釋爲變量

$myquery = "SELECT something FROM somewhere ORDER BY $sortBy,$sortIn"; 

。

Answer 2

嘗試此查詢：因爲你需要使用`

$sortIn = $_POST['SortIn'] 
$sortBy = $_POST['sortBy'] 

$myQuery = "SELECT something FROM somewhere ORDER BY '".sortBy."','".SortIn."'";