使用$ _REQUEST访问PHP页面时出错

Question

<?php
if ($_REQUEST['c'] == "1") {
    echo "<p style=\"text-align: center;\">Your shell account has been setup. Please check your inbox.</p>";
}
elseif ($_REQUEST['c'] == "2") {
    echo "<p style=\"color: red; text-align: center;\">There was a problem setting up your account! Please contact Fike via his details <a href=\"http://fike.me\">here</a>.</p>";
}
else {
    include("elements/signup_form.php");
}

有人能告诉我我做错了什么吗？ 当我请求普通页面时，它应该显示表单，但是它给了我这些错误：

Notice: Undefined index: c in C:\\xampp\\htdocs\\index.php on line 27

Notice: Undefined index: c in C:\\xampp\\htdocs\\index.php on line 30

Answer 1

尝试检查$_REQUEST['c']存在：

<?php
if (isset($_REQUEST['c']) && $_REQUEST['c'] == "1") {
    echo "<p style=\"text-align: center;\">Your shell account has been setup. Please check your inbox.</p>";
}
elseif (isset($_REQUEST['c']) && $_REQUEST['c'] == "2") {
    echo "<p style=\"color: red; text-align: center;\">There was a problem setting up your account! Please contact Fike via his details <a href=\"http://fike.me\">here</a>.</p>";
}
else {
    include("elements/signup_form.php");
}

Answer 2

改为：

if (isset($_REQUEST['c'])) switch ($_REQUEST['c']) {
  case '1':
    echo "<p style=\"text-align: center;\">Your shell account has been setup. Please check your inbox.</p>";
    break;
  case '2':
    echo "<p style=\"color: red; text-align: center;\">There was a problem setting up your account! Please contact Fike via his details <a href=\"http://fike.me\">here</a>.</p>";
    break;
  default:
    require("elements/signup_form.php");
    break;
} else require("elements/signup_form.php");

使用switch可以使用default:值轻松处理$_REQUEST['c']无法识别的值default:并且还可以在将来更轻松地为$_REQUEST['c']新值添加处理程序。

Answer 3

错误基本上是说c没有定义，因此无法检查它是1还是2，你需要确保首先设置变量。

您可以使用名为“isset”的便捷功能来完成此操作，以确定是否已发送请求。 你可以在这里阅读它。

<?php
if (isset($_REQUEST['c'] && $_REQUEST['c'] == "1") {
        echo "<p style=\"text-align: center;\">Your shell account has been setup. Please check your inbox.</p>";
}
elseif (isset($_REQUEST['c'] && $_REQUEST['c'] == "2") {
    echo "<p style=\"color: red; text-align: center;\">There was a problem setting up your account! Please contact Fike via his details <a href=\"http://fike.me\">here</a>.</p>";
}
else {
    include("elements/signup_form.php");
}
?>

我不是最好的PHP人，但可能会有效:)

Answer 4

if (isset($_REQUEST['c']) && $_REQUEST['c'] === "1")
{
    echo '<p style="text-align: center;">Your shell account has been setup. Please      check your inbox.</p>';
}
else if (isset($_REQUEST['c']) && $_REQUEST['c'] === "2")
{
    echo '<p style="color: red; text-align: center;">There was a problem setting up your account! Please contact Fike via his details <a href="http://fike.me">here</a>.</p>';
}
else 
{
    require 'elements/signup_form.php';
}