提交表单信息时为什么会出现空白屏幕？ [重复]

I've been struggling with this form function for the past couple of days and I'm close to having it done! When I click the submit button I just get a blank white screen instead of a pop up of a thank you note and I also dont get an email as I should so I know something is off.

ive tried isset() and messing around with xampp but now I have the site being hosted and I'm running into the white screen

This is the php

    <?php 

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'path/to/PHPMailer/src/Exception.php';
require 'path/to/PHPMailer/src/PHPMailer.php';
require 'path/to/PHPMailer/src/SMTP.php';


$DATE = htmlspecialchars($_POST['DATE']);
$TIME = htmlspecialchars($_POST['TIME']);
$NAME = htmlspecialchars($_POST['NAME']);
$ORDER = htmlspecialchars($_POST['ORDER']);
$EMAIL = htmlspecialchars($_POST['EMAIL']);

$mail = new PHPMailer;

$mail->From = "$EMAIL";
$mail->FromName = "$NAME";

$mail->addAddress("ric*****@gmail.com"); 

$mail->isHTML(true);

$mail->Subject = "Subject Text";
$mail->Body = "$DATE $TIME 
 $NAME 
 $ORDER";
$mail->AltBody = "This is the plain text version of the email content";

if(!$mail->send()) 
{
    echo "Mailer Error: " . $mail->ErrorInfo;
} 
else 
{
    echo "Message has been sent successfully";
}
?>

I want the pop up contact message to appear and an email received to the one listed

</div>

Sorry I don't have enough reputation to comment yet.

A blank page could be the sign of an uncaught Exception: http://php.net/manual/en/language.exceptions.php

try to catch it and var_dump it (page above has samples)

   try {
    //code here
   } catch (\Exception $e) {
    var_dump($e->getMessage());
   }

This will catch any Exception, in this case for debugging I think that is what you want.

Error should appear in your logs as well.