[PHP] php parsing problem with chat

[Deadsam]

Im using a php/flash chat, I added some parsing in it, but now Im having one
problem left to solve, after nickname plus the message (msg) its suppose to
create a new line \n, but if I parse it, and type a link or a swear word
that uses the bad word filtering, it doesnt create a new line after you
press send. It just continues on after you type something in again.I'll add
the script so you can look it over amd let me know if you know where I can
add another \n to make sure it gives me a line break after the parsing.
<?
header("Expires: ".gmdate("D, d M Y H:i:s")."GMT");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
?>
<?

/*        Credits:
*/
/*        Modified for Flashkit by swissLyons: http://www.flashbuilder.ch
based on the http://www.peopleforfun.com version */
/*        Original script by Nicola Delbono <[EMAIL PROTECTED]>        */
/*        Modified by Mario http://www.bludocks.com   */
/*        Modified by Deadsam at http://www.deadsam.com // added parsing for
links and bad word filter */
?>

<?
$nickname = str_replace ("\n"," ", $nickname);
$nickname = str_replace ("<", " ", $nickname);
$nickname = str_replace (">", " ", $nickname);
$nickname = stripslashes ($nickname);
?>
<?
$chat_file2 = "chat.txt";
$lines2 = file($chat_file2);
$count = count($lines2);
echo "&count=$count";
?>
&output=
<?
$chat_file = "chat.txt";
$chat_lenght = 80;
$max_single_msg_lenght = 100000;
$max_file_size = $chat_lenght * $max_single_msg_lenght;
$file_size= filesize($chat_file);
if ($file_size > $max_file_size) {
$lines = file($chat_file);
$a = count($lines);
$u = $a - $chat_lenght;
for($i = $a; $i >= $u ;$i--){
$msg_old =  $lines[$i] . $msg_old;
}
$deleted = unlink($chat_file);
$fp = fopen($chat_file, "a+");
$fw = fwrite($fp, $msg_old);
fclose($fp);
}
$msg = str_replace ("\\","", $message);
//
//IF THE FORGOT TO ADD HTTP:THIS WILL DO IT FOR THEM
$webStart = Array ('WWW', 'www');
$changeWebstart = 'http://www';
$msg = str_replace ($webStart, $changeWebstart, $msg);

//this will take away the double http part
$webDouble = Array ('http://http://www');
$changeWebSingle = 'http://www';
$msg = str_replace ($webDouble, $changeWebSingle, $msg);

        // Swear Word Filtering Section
$badwords = Array ("fuck", "shit", "bastard", "fucker", "fucking",  "bitch",
"cunt", "pussy", "dick",);
$changeto = '<font color="#CCCCFF">******</font>';
$msg = str_replace ($badwords, $changeto, $msg);

// EMAIL PARSER
$msg = ereg_replace("[[:alpha:]]+@[^<>[:space:]]+[[:alnum:]]","<font
color=\"#FFFF00\"><u><a href=\"mailto:\\0\";>\\0</a></u></font>", $msg);

//
// URL PARSER FOR MESSAGE
$msg  = ereg_replace ("[[:alpha:]]+://[^<>[:space:]]+[[:alnum:]]", "<font
color=\"#FFFF00\"><u><a href=\"\\0\"target=\"_blank\">\\0</a></u></font>",
$msg);
//$msg = ereg_replace("\[url\]([^\[]+)\[/url\]", "<font
color=\"#FFFF00\"><u><a href=\"\\1\"target=\"_blank\">\\1</a></u></font>",
$msg);

//
// BOLD, ITALICS, UNDERLINE AND PRE PARSER
$searchFor = Array ('[b]', '[/b]', '[pre]', '[/pre]', '[i]', '[/i]', '[u]',
'[/u]');
$replaceWith = Array ('<b>', '</b>', '<pre>', '</pre>', '<i>', '</i>',
'<u>', '</u>');
$msg = str_replace ($searchFor, $replaceWith, $msg);

//
// END PARSING SECTION


$msg = stripslashes($msg);
if ($msg != ""){
$fp = fopen($chat_file, "a+");
$fw = fwrite($fp, "<font Color=\"$Color\"> $nickname : $msg\n</font>");
fclose($fp);}
$lines = file($chat_file);
$a = count($lines);
$u = $a - $chat_lenght;
for($i = $a; $i >= $u ;$i--){
echo $lines[$i];
}

?>
Thanks in advance for anyone who can help me out
Deadsam



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