php online editor

jeg er ved at lave en php online editor, men jeg har lidt problemer med addslashes() koden til min editor ser sådan ud:

$fil = $_POST['fil'];
$txt = $_POST['txt'];
$Read = $_POST['Read'];


if($fil && $txt && $_POST['Gem']){
/* $txt = stripslashes($txt) */
$hej = chr(92);
$txt = ereg_replace($hej,"",$txt);
$fp = fopen($fil,w);
fputs($fp,$txt);
fclose($fp);
}
if($fil && $Read){
$fp = fopen($fil,r);
$txt = fread($fp,filesize($fil));
fclose($fp);
$txt = addslashes($txt);
}



?>

    <form action="<?php print basename($PHP_SELF); ?>" method="post">
    FILE:
    <input class="field" size="50" type="text" value="<?php echo $fil; ?>" name="fil"/><br>

Tekst:<br>
<textarea rows="25" cols="120" name="txt"><?php print $txt; ?></textarea> <br>
    <input class="button" type="submit" value="Read" name="Read"/>                          <input class="button" type="submit" value="Gem" name="Gem"/>
    </form>