Help needed on this spam-filter code,thank you

[Tikila]

$badwords = array("rat","badword2","badword3");  foreach($badwords as $word=>$key) {   if(strpos($message,$key) !== false) { echo 'inappropriate content ';   break; } } 

Now I found out any other word that include "rat" is caught(i.e brat,rattle,etc)

Can anyone help me modify the code so it ony rejects "rat" and allow "brat" ?
Cramblibu once helped me with this code but it does not work

 $badwords = array("rat","badword2","badword3");  $pattern = sprintf('/\b%s\b/i', implode('|', array_map('preg_quote', $badwords))); if (preg_match($pattern, $message)) {     // case insensitive badword found } 

[krzyk]

The string tha tyou have in sprinf, should be like this:
'/\b(%s)\b/i'

[Ernie1]

It works:

$message = "rat brat badword2 badword3 foo bar";
$badwords = array( "rat", "badword2", "badword3" );

$pattern = sprintf( '/\b%s\b/i', implode('|', array_map('preg_quote', $badwords)) );
echo preg_replace( $pattern, "", $message ); 

[crmalibu]

krzyk is right, it should be '/\b(%s)\b/i'

Tikila, why do you massacre the code and put it all one one line?

[Tikila]

Thanks everyone but am still having problems with the code

$badwords = array("rat","brat","work from home");
$pattern = sprintf('/\b(%s)\b/i', implode('|', array_map('preg_quote', $badwords)));
 if (preg_match($pattern, $message)) {     // case insensitive badword found } 

problem i have is that the code does not work if includes bad words like "</div>","</p>" // the slash part.