为什么变量没有传递给查询？

Question

我有PHP代码从下拉菜单中获取值并在查询中使用它们。然而他们被忽略了。这是一个例子：

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

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

但是查询执行为$myquery = 'SELECT something FROM somewhere'

Answer 1

更改为：

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

因为在单引号中$sortBy和$sortIn并未将其解释为变量。

Answer 2

尝试此查询：

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

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