PHP邮件在页面加载上发送空白消息

I am having an issue with PHP Mailer. It is sending a blank email every time the page is loaded.

I'm sure it's something simple (maybe missing a condition if submit button is hit) to fix this.

Their documentation doesn't seem to have one though and the script first worked when I first used it but then started sending emails on page load after the first few times. Thanks!

<form method="post" action="">
    <div class="form-group">
        <input name="name" type="text" class="form-control" placeholder="Enter Name">
    </div>
    <div class="form-group">
        <input name="email" type="email" class="form-control" placeholder="Enter Email">
    </div>
    <div class="form-group">
        <input name="subject" type="text" class="form-control" placeholder="Enter Subject">
    </div>
    <div class="form-group">
         <textarea name="message" class="form-control" rows="5" placeholder="Enter Message"></textarea>
    </div>
    <button name="submit" type="submit" value="submit" class="btn btn-submit">Submit</button>
</form>

<?php 

require '/phpmailer/PHPMailerAutoload.php';
require_once('/phpmailer/class.phpmailer.php');
include("/phpmailer/class.smtp.php");

$emailaddress = 'info@newpointdigital.com';

$message=
    'Name:  '.$_POST['name'].'<br />
    Email:  '.$_POST['email'].'<br />
    Subject:    '.$_POST['subject'].'<br />
    IP: '.$_SERVER['REMOTE_ADDR'].'<br /><br />
    Message:<br /><br />
    '.nl2br($_POST['message']).'
    ';

$mail             = new PHPMailer();
$mail->IsSMTP(); // telling the class to use SMTP
$mail->Host       = "smtp.gmail.com"; // SMTP server
//$mail->SMTPDebug  = 2;                     // 1 = errors and messages,2 = messages only
$mail->SMTPAuth   = true;                  // enable SMTP authentication
$mail->Host       = "smtp.gmail.com"; // sets the SMTP server
$mail->Port       = 465;                    // set the SMTP port for the GMAIL server
$mail->Username   = "info@newpointdigital.com"; // SMTP account username (the email account your created)
$mail->Password   = "newpoint!@#$";        // SMTP account password (the password for the above email account)
$mail->SMTPSecure = 'ssl';                            // Enable encryption, 'ssl' also accepted

$mail->CharSet  = 'UTF-8';  // so it interprets foreign characters
$mail->SetFrom($_POST['email']);
$mail->AddReplyTo($_POST['email']);
$mail->Subject    = "Contact form from ".$_POST['name']." ";
$mail->MsgHTML($message);

$mail->AddAddress($emailaddress);

if(!$mail->send()) {
    echo 'Message could not be sent.';
    echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
    echo 'Message has been sent';
}       
?>

You don't check to see if a form submission occurred. You just call your email code when the page loads. There are several ways to decide if a form submission occurred. One way is to check to see if the form action is POST:

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // email code goes here
}

You can also check to see if the submit button was pressed:

 if (isset($_POST['submit'])) {
      // email code goes here
 }

Other things to know:

• You don't do any data validation so it is still possible for someone to submit nothing resulting in a blank email being sent
• You don't protect against header injections which makes your form vulnerable to sending spam

This happen cause you didn't apply any condition for this to run so code runs line by line on page load .

so keep your mail sending code in submit check condition so it will run after submit click

if(isset($_POST['submit'])) {
  // your mail sending code
}

or using any of your post data like for email check

if(!empty($_POST['email'])) {
  // your mail sending code
}