HTML電子郵件表格PHP

Question

我有一個適用於PHP代碼的HTML表單，並且我收到了發送給我的電子郵件，但是，如果沒有主題，沒有電子郵件也沒有消息，我可以收到一封電子郵件。 也許有人知道該如何解決？ 這是PHP代碼：

<?php
$field_name = $_POST['cf_name'];
$field_email = $_POST['cf_email'];
$field_message = $_POST['cf_message'];

$mail_to = 'benasleng@gmail.com';
$subject = 'Message from a site visitor '.$field_name;

$body_message = 'From: '.$field_name."\n";
$body_message .= 'E-mail: '.$field_email."\n";
$body_message .= 'Message: '.$field_message;

$headers = 'From: '.$field_email."\r\n";
$headers .= 'Reply-To: '.$field_email."\r\n";

$mail_status = mail($mail_to, $subject, $body_message, $headers);

if ($mail_status) { ?>
    <script language="javascript" type="text/javascript">
        alert('Thank you for the message. We will contact you shortly.');
        window.location = 'index.html';
    </script>
<?php
}
else { ?>
    <script language="javascript" type="text/javascript">
        alert('Message failed. Please, send an email to benasleng@gmail.com');
        window.location = 'index.html';
    </script>
<?php
}
?>
<?php
function IsInjected($str)
{
    $injections = array('(\n+)',
           '(\r+)',
           '(\t+)',
           '(%0A+)',
           '(%0D+)',
           '(%08+)',
           '(%09+)'
           );

    $inject = join('|', $injections);
    $inject = "/$inject/i";

    if(preg_match($inject,$str))
    {
      return true;
    }
    else
    {
      return false;
    }
}

if(IsInjected($visitor_email))
{
    echo "Bad email value!";
    exit;
}
?>

Answer 1

在調用mail（）函數之前，應檢查字段是否已編譯。

這只是一個草稿示例，因為我建議您使用比empty（）函數更復雜的檢查，尤其是在$ field_email上，例如：

if (empty($field_name) || !filter_var($field_email, FILTER_VALIDATE_EMAIL) || empty($field_message)) {
  ?>
    <script language="javascript" type="text/javascript">
        alert('All fields must be correctly compiled');
        window.location = 'index.html';
    </script>
<?php

} else {


$mail_status = mail($mail_to, $subject, $body_message, $headers);

if ($mail_status) { ?>
    <script language="javascript" type="text/javascript">
        alert('Thank you for the message. We will contact you shortly.');
        window.location = 'index.html';
    </script>
<?php
}
else { ?>
    <script language="javascript" type="text/javascript">
        alert('Message failed. Please, send an email to benasleng@gmail.com');
        window.location = 'index.html';
    </script>
<?php
}
}

Answer 2

嘗試添加標題並使用mail（）函數：

$headers  = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=utf-8' . "\r\n";
$headers .= 'From: Mail <mail@mail.someadress.com>';

mail($mail_to, $subject, $body_message, $headers);