Salto de linea archivo txt con php

[karakarton]

<?php
$saving = $_REQUEST['saving'];
if ($saving == 1) {
$data = $_POST['data'];
$file = "texto_pizza/pizza1.txt";
echo "<META HTTP-EQUIV='refresh' CONTENT='0; URL=uploadpizz.php'>";

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

fclose($fp);
echo "Guardado $file!";
}
?>
<form name="form1" method="post" action="uploadpizz.php?saving=1">
<textarea name="data" cols="25" rows="3">
<?php
$file = "texto_pizza/pizza1.txt";
if (!empty($file)) {
$file = file_get_contents("$file");
echo $file;
}
?>
</textarea>
<br>
<input type="submit" value="Guardar">
</form>