错误计数 - PHP

Question

我有一个以电子邮件作为字段名称的表单。我想要做的是，如果电子邮件不等于 $emailToCheck 不等于 $_POST['email']，它应该在第一次时抛出错误。第二次，如果用户再次输入错误的电子邮件 ID，即使页面刷新，它也应该始终重定向到 "error.htm"。

即使电子邮件 ID 输入错误两次，表单始终显示也不起作用。

  <?php

if (!empty($_POST['email'])) {
    $email="website@test.com";
    if($email!=$_POST['email'])
    {
        $count="1";
    }
    if($count=="2"){
    header("Location: /error.htm");
        exit(0); 
    }
}

if($count!="2"){
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Form</title>
</head>
<body id="main_body" >

    <div id="form_container">

        <h1><a>Form</a></h1>
        <form id="form_1123848" class="appnitro"  method="post" action="">
                    <div class="form_description">
            <h2>Form</h2>
            <p> <input type="text" name="email" value="" /></p>
        </div>                      
            <ul >

                    <li class="buttons">
                                    <input id="saveForm" class="button_text" type="submit" name="submit" value="Submit" />
        </li>
            </ul>
        </form> 


    </body>
</html>
<?
}
?>

Answer 1

表单提交后，页面会重新加载，计数器会重置。为了实际计数，您需要在表单中提供该值，并在提交表单时将其传递给 PHP。

<?php

// Try to get the amount of attempts from the POSTed data
$count = isset($_POST['count']) ? $_POST['count'] : 0;

if (isset($_POST['email'])) {
  $email = "website@test.com";

  if ($email != $_POST['email']) {
      $count++;
  }

  if ($count == 2) {
    header("Location: /error.htm");
  }
}

if ($count <= 2):
?>

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Form</title>
    </head>

    <body id="main_body" >
        <div id="form_container">
            <h1><a>Form</a></h1>
            <form id="form_1123848" class="appnitro"  method="post" action="">
                <!-- Let the POST data know this is the x attempt -->
                <input type="hidden" name="count" value="<?php echo $count; ?>">

                <div class="form_description">
                    <h2>Form</h2>
                    <p> <input type="text" name="email" value="" /></p>
                </div>
                <ul>
                    <li class="buttons">
                        <input id="saveForm" class="button_text" type="submit" name="submit" value="Submit" />
                    </li>
                </ul>
            </form>
        </div>
    </body>
</html>

<?php endif; ?>

此外，您的编码风格远非一致。努力解决这个问题！

Answer 2

这里有两个问题：

1. 您将 $count 定义为字符串，并且从不递增它。如果您查看您的代码，每次不匹配时 $count 都会被专门设置为 1。应该如何到达 2？

2. 此外，这里的数据是无状态的。脚本应该如何知道 $count 在上一次调用中设置的值？您还需要将 $count 设置为会话变量，以便脚本知道其先前的值。

您应该尝试将您的代码更新为与此类似的内容：

// Check if `email` passed in POST request:
if ($_POST['email']) {
  $email = "website@test.com"; //Manually define expected email address.

  // Check if provided email does *not* match the expected email:
  if ($email !== $_POST['email']) {
    // Record the mismatch attempt in session and increment:
    if (!($_SESSION['incorrectEmailCount'])) {
      // If this is the first mismatch, define the session variable, and set to 1. 
      $_SESSION['incorrectEmailCount'] = 1;
    } else {
      // Session variable already set due to previous mismatch. Increment it.
      $_SESSION['incorrectEmailCount']++;
    }
  }
  // If user entered incorrect email more than once:
  if ($_SESSION['incorrectEmailCount'] > 1) { 
    // Redirect to error page and stop execution. 
    header("Location: /error.htm");
    exit(0); 
  }
}

错误计数 - PHP

Error Count - PHP

php

session-variables