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是否可以使用onsubmitJavaScript 从PHP调用函数？如果是这样,有人能给我一个如何做的例子吗？

function addOrder(){
    $con = mysql_connect("localhost", "146687", "password");
    if(!$con){
        die('Could not connect: ' . mysql_error())
    }

    $sql = "INSERT INTO orders ((user, 1st row, 2nd row, 3rd row, 4th row)
    VALUES ($session->username,1st variable, 2nd variable, 3rd variable, 4th variable))";

    mysql_query($sql,$con)
    if(mysql_query($sql,$con)){
        echo "Your order has been added";
    }else{
        echo "There was an error adding your order to the databse: " . mysql_error();
    }
}

这是我想要打电话的功能.它是一个订购系统,您输入您想要的每件商品的数量,点击提交,它应该将订单添加到表中.