如果联系人表单输出中发生错误，PHP 将显示一个 html 页面

我有一个简单的表格，上面有一个安全问题，以防止垃圾邮件。链接到我的网页，其中包含 http://ddry.co.uk/contact_us.html 有问题的表格。

我希望能够在用户输入错误答案而不仅仅是纯文本时输出 html 页面。

如果表单在我的 php 脚本底部成功，我有一个重定向到另一个 html 文件。 查看其他论坛，有人建议使用readfile（"联系人失败.html#失败"）; 显示网页;但是，我不完全确定将错误答案重定向的代码放在哪里。我是PHP的新手，所以如果有人能够解释我做错了什么，那就太好了。或者，如果 somone 有更好的垃圾邮件过滤器代码，那也很棒 提前感谢。

反垃圾邮件的HTML代码

用于发布 PHP 文件。

-----更新--------

我认为我所追求的是如果，否则陈述？经过研究，我更改了我的代码以包含 else 语句;但是，由于我缺乏PHP知识，我仍然得到一个空白屏幕，而不是我的错误重定向html页面，该页面显示在我的php代码底部。

问题：如何正确配置 if， else 语句，以便如果反垃圾邮件结果错误（不等于 12），则继续联系失败.html？

提前致谢

 <?php
  // Email address verification
  function isEmail($clientEmail) {
return filter_var($clientEmail, FILTER_VALIDATE_EMAIL);}
 if($_POST) {
// Enter the email where you want to receive the message
$myemail = 'info@ddry.co.uk';
$name = addslashes(trim($_POST['name']));
$clientEmail = addslashes(trim($_POST['email']));
$subject = addslashes(trim($_POST['phone']));
$phone = addslashes(trim($_POST['phone']));
$message = addslashes(trim($_POST['message']));
$antispam = addslashes(trim($_POST['antispam']));
$array = array('nameMessage' => '','emailMessage' => '', 'phoneMessage' => '', 'messageMessage' => '', 'antispamMessage' => '');

if(!isEmail($clientEmail)) {
    $array['nameMessage'] = 'Empty name';
}
if(!isEmail($clientEmail)) {
    $array['emailMessage'] = 'Invalid email!';
}
    if($phone == '') {
    $array['phoneMessage'] = 'Empty phone number!';
}
if($message == '') {
    $array['messageMessage'] = 'Empty message!';
}
if($antispam != '12') {
    $array['antispamMessage'] = 'Incorrect Answer!';
}
if(isEmail($clientEmail) && $clientEmail != '' && $message != '' &&       $antispam == '12') {
    // Send email
    $to = $myemail;
 $email_subject = "Contact form submission: $name";
 $email_body = "You have received a new message. ".
 " Here are the details:'n Name: $name 'n ".
 "Email: $clientEmail'n Message: 'n $message'n Phone: $phone";
 $headers = "From: $myemail'n";
 $headers .= "Reply-To: $clientEmail";
 mail($to,$email_subject,$email_body,$headers);

echo json_encode($array);
header('Location: contact-success.html#success'); 
}
else (isEmail($clientEmail) && $clientEmail != '' && $message != '' &&     $antispam !== '12'){
       echo('Location: contact-failed.html#fail');} 
?>

function isEmail($clientEmail) {
    return filter_var($clientEmail, FILTER_VALIDATE_EMAIL);
}
if($_POST){
    // Enter the email where you want to receive the message
    $myemail = 'info@ddry.co.uk';
    $name = addslashes(trim($_POST['name']));
    $clientEmail = addslashes(trim($_POST['email']));
    $subject = addslashes(trim($_POST['phone']));
    $phone = addslashes(trim($_POST['phone']));
    $message = addslashes(trim($_POST['message']));
    $antispam = addslashes(trim($_POST['antispam']));
    if($antispam == '12' && isEmail($clientEmail) && $phone != '' && $message != ''   ){
        $to = $myemail;
        $email_subject = "Contact form submission: $name";
        $email_body = "You have received a new message. ".
        " Here are the details:'n Name: $name 'n ".
        "Email: $clientEmail'n Message: 'n $message'n Phone: $phone";
        $headers = "From: $myemail'n";
        $headers .= "Reply-To: $clientEmail";
        mail($to,$email_subject,$email_body,$headers);
        echo json_encode($array);
        header('Location: contact-success.html#success'); 
    }
    else {
        header('Location: contact-failed.html#fail');
    }