php form to text append

[kinshiro]

I am new to this forum and new to PHP. But, I'm looking for help with a piece of code I have been working on. What I'm trying to do is use a form to post to a textfile and each time someone uses the form, have the text be appended. I started out with a simple form design to see if I could get it to work and then I plan on doing something more complex with it, but I can't seem to get the simple one to work right.
My form code:

<form action="addition.php" method="post">

<input type="text" name="addition"> <br>
<input type="submit" value="submit">
</form>

My php (addition.php):

$fn = "file.txt";
$file = fopen($fn, "a+");
$size = filesize($fn);
$space.= "\n";
if($_POST['addition']) fwrite($file, $_POST['addition']);

$text = fread($file, $size);
fwrite ($file, $space);
fwrite ($file, "____");
fclose($file);

My problem is that I can't figure out how to have the next post, input a carriage return so that the new data starts on a new line, or even to input some text before the user's input. Any help would be appreciated.

[borris83]

Replace the line

$space.= "\n";

with

$space.= chr(13) . chr(10);

It will work.. I tested with your code.

[Schmoopy]

Alternatively you can write the space like this:

$space = "\r\n"; 

And then I've added some validation, this also shows the output of the text file after the fwrite:

if($_POST['addition']) {
    $fn = "file.txt";
    $file = fopen($fn, "a+");
    $space = "<br />\r\n";
    fwrite($file, $_POST['addition']);
    fwrite ($file, $space);
    fclose($file);
    // Open file again to read new content
    $reader = fopen($fn, "r");
    $size = filesize($fn);
    $data = fread($reader, $size);
    echo "Your message has been added.<br />\n";
    echo $data;
}
else
    echo 'You didn\'t enter any text.'; 

[kinshiro]

Thanks guys. I appreciate it.