自动递增数组索引 (PHP)

Question

刚刚进行了搜索，但找不到具有适当答案的问题。我正在尝试将 product_id 添加到数组的末尾，每次添加一些东西时，它也会添加到数组中。目前，每次我添加 product_id 时，它都会替换之前的任何内容。我得到的只是 Array[0] 处的一个 product_id。下面是我添加到数组中的代码部分。然后我使用

print_r($order);

显示数组中的内容。

$order = array();

switch ($action)
    {

    // Add

case "add":

$order[] = $product_id;
        break;
        }

这是页面中的完整代码减去一些 MySQL 内容。

include 'connection.php';

if (isset($_GET['action']))
    {
    $action = $_GET['action']; //Get's action from the URL
    }

if (isset($_GET['product_id']))
    {
    $product_id = $_GET['product_id']; //the action from the URL
    }

// if there is an product_id and that product_id doesn't exist display an error message



if ($product_id && !productExists($product_id))
    {
    die("Error. Product Doesn't Exist");
    }

switch ($action)
    { //decide what to do

    // Add

case "add":

$order[] = $product_id;

    if (isset($_SESSION['user']))
        {
        $productadd = sprintf("INSERT INTO tbl_basket (customer_id, product_id, basket_status) VALUES ('" . $_SESSION['user'] . "','$product_id','basket')");
        mysql_query($productadd);
        break;
        }
      else
        {

        $productadd = sprintf("INSERT INTO tbl_basket (customer_id, product_id, basket_status, user_type) VALUES ('" . $_SESSION['guestuser'] . "','$product_id','basket', 'guest')");
        mysql_query($productadd);
        break;
        }

    // Remove

case "remove":
    if (isset($_SESSION['user']))
        {
        $productremove = sprintf("DELETE FROM tbl_basket WHERE customer_id = '" . $_SESSION['user'] . "' AND product_id = '$product_id'");
        mysql_query($productremove);
        break;
        }
      else
        {
        $productremove = sprintf("DELETE FROM tbl_basket WHERE customer_id = '" . $_SESSION['guestuser'] . "' AND product_id = '$product_id'");
        mysql_query($productremove);
        break;
        }

    // Empty

case "empty":
    if (isset($_SESSION['user']))
        {
        $empty = sprintf("DELETE FROM tbl_basket WHERE customer_id = '" . $_SESSION['user'] . "' AND order_status = 'basket'");
        mysql_query($empty);
        break;
        }
      else
        {
        $empty = sprintf("DELETE FROM tbl_basket WHERE customer_id = '" . $_SESSION['user'] . "' AND order_status = 'basket'");
        mysql_query($empty);
        break;
        }
    }

if (isset($_SESSION['user']))
    {
    $result = mysql_query("SELECT * FROM tbl_basket a INNER JOIN tbl_products b ON a.product_id = b.product_id WHERE a.customer_id = '" . $_SESSION['user'] . "'");
    }
  else
    {
    $result = mysql_query("SELECT * FROM tbl_basket a INNER JOIN tbl_products b ON a.product_id = b.product_id WHERE a.customer_id = '" . $_SESSION['guestuser'] . "'");
    }

Answer 1

当您执行$order = array(); 时，您会清除$order 中的先前值
只需删除该行，$order[] = $product_id; 就会在数组中添加另一个项目。