好吧，我想做的是，让这个按钮插入时，运行buy\u item.php，我的tottality lost，我想让脚本检查金额（钱包钱）的用户和检查价格的点击按钮的项目（每个项目是相关的购买按钮），如果他们有足够的钱它买。但是scrript不起作用，按钮更新了

<?php
$conn = mysqli_connect("localhost", "localhost", "localhost", "localhost");
if ($conn->connect_error) { 
 die("Connection failed: " . $conn->connect_error);
 } 
   $sql = "SELECT id,type, price,seller FROM items 

$result = $conn->query($sql);
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
echo "<tr>";
echo '<td><form action="buy_item.php"><button>a</button></form></td>'; 
        echo "</tr>";

}
echo "</table>";
} else { echo "0 results"; }
$conn->close();
?>
</table>

购买物品.php

<?php
session_start();
$conn = mysqli_connect("localhost", "localhost", "localhost", "localhost");
if ($conn->connect_error) { 
die("Connection failed: " . $conn->connect_error);
} 
$sql = "SELECT price,username,amount FROM items,users WHERE username = '" . 
$_SESSION['username'] . "' ";

$result = $conn->query($sql);
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
   if   $row["amount"]  >= $row["price"]  {
      $newAmount =  $row["amount"]  - $row["price"] ;
        header("location:/quickshops/seller/tutoadd.php");

        } 
        else
            {
                                echo "You got no enough money buddy.";
      } 
     }