PHP：注意：未定义的索引：第9行的C：\\ xampp \\ htdocs \\ vdab \\ cookies.php中的NameFilledIn

Question

I'm new at PHP and although i found similar solutions for this error, i cannot solve it yet. 我是PHP的新手，尽管我针对此错误找到了类似的解决方案，但仍无法解决。 When running this page i get the error: Notice: Undefined index: NameFilledIn in C:\\xampp\\htdocs\\vdab\\cookies.php on line 9. When I fill in a name and refresh the page, it does work. 运行此页面时，出现错误：注意：未定义索引：第9行的C：\\ xampp \\ htdocs \\ vdab \\ cookies.php中的NameFilledIn。当我填写名称并刷新页面时，它确实起作用。 Once the time of the cookie is passed and I refresh the page, I get the same error as in the beginning. 一旦Cookie的时间过去了，并且刷新了页面，就会收到与开始时相同的错误。

The complete code is: 完整的代码是：

<?php
 if (!empty($_POST["txtName"]))
     {
      setcookie("NameFilledIn", $_POST["txtName"],time() + 60);
      $name = $_POST["txtName"];
     }
     else
     {
      $name = $_COOKIE["NameFilledIn"];
     }
?>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org /TR/html4/loose.dtd">
<html>
<head>
</head>
<body>
<?php
  if (isset($name))
  {
   print ("Welcom, ") . $name;
  }
?>
  <form action="cookies.php" method="POST">
  Uour name: <input type="text" name="txtName" value="<?php print ($name);?>">
  <input type="submit" value="Send">
  </form>

<br><br>
<a href="cookies.php">Refresh the page</a>
</body>
</html>

Answer 1

The notice Undefined index: occurred because you are trying to access cookie without checking whether it is set or not. 出现Undefined index:通知，是因为您尝试访问cookie而不检查是否设置了cookie。 Use isset() to check if they are declared before referencing them like, 使用isset()在引用它们之前检查它们是否已声明，

 if (!empty($_POST["txtName"]))
     {
      setcookie("NameFilledIn", $_POST["txtName"],time() + 60);
      $name = $_POST["txtName"];
     }
     else
     {
       if(isset($_COOKIE["NameFilledIn"]))   // only if it is set
         $name = $_COOKIE["NameFilledIn"];
     }

The same thing you have to check everywhere you are trying to echo/access the PHP variables. 您必须在试图回显/访问PHP变量的所有地方检查同一件事。

<input type="text" name="txtName" value="<?php if(isset($name)) { print ($name); } ?>">

PHP：注意：未定义的索引：第9行的C：\\ xampp \\ htdocs \\ vdab \\ cookies.php中的NameFilledIn

问题描述

1 个解决方案

解决方案1
1 2014-09-22 09:44:48

PHP：注意：未定义的索引：第9行的C：\\ xampp \\ htdocs \\ vdab \\ cookies.php中的NameFilledIn

问题描述

1 个解决方案

解决方案1 1 2014-09-22 09:44:48

解决方案1
1 2014-09-22 09:44:48