ANTI-SWEAR FEATURE FOR SHOUTBOX

[define_php]

Hi, me again, having another error. I need a anti-swear feature. Here is my non-working code:

<?php
if (isset($_POST["name"], $_POST["text"])) {
    $contents = strip_tags($_POST["name"]) . ' : '
        . strip_tags($_POST["text"]) . "<br>";
		$data = file('filter.txt');
		foreach($file as $val){ 
		$ding = explode('!', $ding); 
		$contents = str_ireplace($ding[0], $ding[1], $_POST['text']);
		}
    if (file_put_contents("comments.txt", $contents, FILE_APPEND) === false) {
        die("Robbit Shout is down, try again later.");
    }
}

echo file_get_contents("comments.txt");

?> 

The error: "Notice: Undefined variable: file in /www/sitegoz.com/p/a/r/partypad/htdocs/index.php on line 53

Warning: Invalid argument supplied for foreach() in /www/sitegoz.com/p/a/r/partypad/htdocs/index.php on line 53"

The contents of "filter.txt":

"SWEARWORD!****" ... etc

Please help?

[dagon]

foreach($file as $val){
should be
foreach($data as $val){