New line in PHP output in a text file

Question

My php form which saves the output in a text file glues the result to one string like:

Name1Email1The Message1Name2Email2The Message2Name3Email3The Message3Name4Email4The Message4

But I need spaces and/or newlines. I normaly don't use PHP so I don't get it. I did't find an answer on the web, also read some Q/A here, but this didn't help me.

The Form:

<form action="mailer.php?savedata=1" method="post">
Your Name: <input type="text" name="name"><br>
Your Email: <input type="text" name="email"><br>
Your Message:<br> <textarea name="message" rows="5" cols="30"></textarea><br>
<input type="submit" name="submit" value="Submit">
</form>

The PHP

<?php
$savedata = $_REQUEST['savedata'];
if ($savedata == 1){ 
$data = $_POST['name'];
$data .= $_POST['email'];
$data .= $_POST['message'];
$file = "YOURDATAFILE.txt"; 

$fp = fopen($file, "a") or die("Couldn't open $file for writing!");
fwrite($fp, $data) or die("Couldn't write values to file!"); 

fclose($fp); 
echo "Your Form has been Submitted!";

}
?>

Answer 1

You can use "\n" to write a new line.

$data = $_POST['name'] . "\n";
$data .= $_POST['email'] . "\n";
$data .= $_POST['message'] . "\n";

Just as a sidenote, \n has to be in doublequotes. When surrounded by single quotes it won't work.

Answer 2

As other answers state, you need to add in an end of line character after each field.

Different OS's use different line endings, though, and so a "\n" may not display as a new line on Windows, for example. As Mahdi said, you can use Windows style "\r\n" line endings, or you can use the PHP_EOL constant so that line endings appropriate to the server will be output, in which case your code would look like

$data = $_POST['name'] . PHP_EOL;
$data .= $_POST['email'] . PHP_EOL;
$data .= $_POST['message'] . PHP_EOL;