Question

我是php编程的新手并且收到错误：

未定义的索引参数和数据未发送到数据库

请帮助

<?php require_once("navig.php");
$cool=$_SESSION['user_id'];

if(isset($_SESSION['user_id'])) {
    ?>
<form name="form" method="GET" action="<?php echo $_SERVER['PHP_SELF'] ?>"> 
<a href='http://www.amazon.in/?tag=rewardadda-21&param=<?php echo $_SESSION['user_id'] ?>'><img src=images/a.png ></a>
</form>

<?php
    require_once('connect.php');
    $dbb = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME)
        or die('Error communicating to MySQL server.');
        $cool=$_GET['param'];
    $querye = "INSERT INTO orderdata(user_id, store_used) ".
                        "VALUES ('$cool', 'amazon')";
    mysqli_query ($dbb, $querye);                       
    mysqli_close($dbb);     
}               
?>

Answer 1

你没检查是$ cool = $ _ GET ['param'];有任何价值（$ _GET ['param']在$ _GET数组存在）

尝试下一步：

if(isset($_SESSION['user_id'])) {
  ?>
  <form name="form" method="GET" action="<?php echo $_SERVER['PHP_SELF'] ?>">
  <a href='http://www.amazon.in/?tag=rewardadda-21&param=<?php echo $_SESSION['user_id'] ?>'><img src=images/a.png ></a>
  </form>

<?php
  require_once('connect.php');
  $dbb = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME) or die('Error communicating to MySQL server.');
  if(isset($_GET['param'])){ // add this checking
    $cool=$_GET['param'];
    $querye = "INSERT INTO orderdata(user_id, store_used) ".
            "VALUES ('$cool', 'amazon')";
    mysqli_query ($dbb, $querye);                       
    mysqli_close($dbb); 
  }    
}

但这是不好的做法 - 以这种方式从字符串创建查询。阅读有关PDO和准备好的陈述

同时检查您是否通过了GET参数 - 您应该像

一样调用您的脚本

/index.php?param=value1

$ _Get变量无法在数据库中存储数据

1 个答案: