在php中插入换行符

这恰好是我在这里的第一篇文章，而且我不是程序员，但多亏了这样的论坛，我确实找到了绕过代码的方法。下面是我从某个地方挑选出来的一个代码，我已经在一个发布到我的电子邮件中的表单中实现了它。我现在的问题是，当我在邮件中收到填写好的表格的副本时，整个信息都被打包成一行，我尝试使用''n for换行符，但都没有用。

然而，这并不是整个代码，但我确实觉得问题出在这些代码中。

这就是我得到的；

First Name: 3 Last Name: s Date of Birth: 1/1/1111 Gender: Female Address Line1: a Address Line2: a etc ...

当我真正想要的是结果看起来像这样的时候；

First Name: 3 
Last Name: s 
Date of Birth: 1/1/1111 
Gender: Female 
Address Line1: a 
Address Line2: a 
etc ....

下面是被截断的代码。

$message="First Name: ".$firstname." 
Last Name: ".$lastname." 
Date of Birth: ".$dateofbirth." 
Gender: ".$gender." 
Address Line1: ".$address1." 
Address Line2: ".$address2." 
City: ".$city." 
State: ".$state." 
Country: ".$country." 
Zip Code: ".$zipcode." 
Phone Number: ".$phone." 
Email: ".$email." 
Fax: ".$fax." 
Type of Identification: ".$identification." 
Expiry Date: ".$expiry." 
Identification Number: ".$idnumber." 
Occupation: ".$occupation." 
Annual Salary: ".$salary." 
Position: ".$position." 
Office Address: ".$oaddress." 
Office Phone: ".$ophone." 
Employer's Name: ".$ename." 
Account Type: ".$accountype." 
";
$message = stripslashes($message);

$from = "$email";
if (!empty($_FILES['picture']['tmp_name'])) {

// Get attachment
$imagename = $_FILES['picture']['name'];
$source = $_FILES['picture']['tmp_name'];
$target = "../account/ids/".$imagename;
move_uploaded_file($source, $target);

$suffix  =strtolower(substr($target, -3));
                  switch($suffix) {
                    case 'gif': $typ = "image/gif"; break;
                    case 'jpg': $typ = "image/jpg"; break;
                    case 'peg': $typ = "image/jpeg";break;
                    case 'png': $typ = "image/png"; break;
                    case 'pdf': $typ = "application/pdf"; break;
                    case 'zip': $typ = "application/zip"; break;
                  }
              $subject = "Online Account Application Form";
              $fileatt = $target;
              $fileatttype = $typ;
              $fileattname = $imagename;
              $headers = "From: $from";
              $file = fopen( $fileatt, 'rb' );
              $data = fread( $file, filesize( $fileatt ) );
              fclose( $file );
              $semi_rand = md5( time() );
              $mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";
              $headers .= "'nMIME-Version: 1.0'n" .
                          "Content-Type: multipart/mixed;'n" .
                          " boundary='"{$mime_boundary}'"";
              $message = "This is a multi-part message in MIME format.'n'n" .
                      "--{$mime_boundary}'n" .
                      "Content-Type: text/html; charset='"utf-8'"'n" .
                      "Content-Transfer-Encoding: 7bit'n'n" .
                      $template_top.$message.$template_bottom . "'n'n";
              $data = chunk_split( base64_encode( $data ) );
              $message .= "--{$mime_boundary}'n" .
                       "Content-Type: {$fileatttype};'n" .
                       " name='"{$fileattname}'"'n" .
                       "Content-Disposition: attachment;'n" .
                       " filename='"{$fileattname}'"'n" .
                       "Content-Transfer-Encoding: base64'n'n" .
                       $data . "'n'n" .
                       "--{$mime_boundary}--'n";

提前感谢您的帮助。