小编tir*_*nci的帖子

我有2页sell.php和sell_form.php.当用户从sell_form.php的下拉菜单中选择股票代码时,我在sell.php中有一个查询,该查询应该从数据库中删除该股票代码,但我现在得到的只是一个空白页面我点击卖出按钮.我不确定我是否完全理解下拉菜单中的值如何传递给sell.php表单.这是我到目前为止的代码

这是我的sell.php文件

if ($_SERVER["REQUEST_METHOD"] == "POST") 
{



    // delete the stock from their portfolio 
query("DELETE FROM shares WHERE id = ? AND symbol = ?", $_SESSION["id"],$_POST["symbol"]);  

redirect("/");
}
else
{

$rows = query("SELECT * FROM shares WHERE id = ?", $_SESSION["id"]);

    //create array to store the shares
    $shares = [];

    //for each of the user info

    foreach($rows as $row){

        //lookup stock info
        $stock = lookup($row["symbol"]);
        if($stock !== false){

            $shares[] = [
                "name" => $stock["name"],
                "price" => $stock["price"],
                "shares" => $row["shares"], …