电话号码没有显示在我的PHP代码$formcontent

<?php
                 $Name = $_POST['Name'];
                 $Email = $_POST['Email'];
                 $Number= $_POST['Number'];
                 $Message= $_POST['Message'];
                 $formcontent="
                     Name: $Name 'n
                     Number: $Number 'n
                     Email: $Email 'n
                     Message: $Message";
                 $recipient = "info@domain.com";
                 $subject = "Contact Form";
                 $mailheader = "From: $Email 'r'n";
                 mail($recipient, $subject, $formcontent, $mailheader) or               die("Error!");
                 echo "Thank You!";
?>

number不显示，但name、email、message以formcontent显示。执行时显示空白区域代替数字。

三。