[SOLVED] PHP Bad word filter

[DeanWhitehouse]

I have made this bad word filter, and i want it to be able to find the bad word whether it is in lowercase (e.g. f*ck), uppercase (e.g. F*CK) or a mixture (e.g. F*cK)

I want to do this without changing the comment (it's a comment system) to lowercase or uppercase.

 

This is how i tried it

<?php
$bad = array('removed for younger/more sensitive readers. In summary it contained a list of banned words, with variations. Some in mixed cases');
if(isset($_POST['Go!']))
{
$name = make_safe($_POST['name']);
$message = make_safe($_POST['msg']);

foreach($bad as $low)
{
	$bader[] = strtolower($low);
}

foreach($bad as $high)
{
	$worse[] = strtoupper($high);
}

foreach($bad as $first)
{
	$omg[] = ucfirst($first);
}

$name = str_replace($bader,"*****",$name);
$name = str_replace($worse,"*****",$name);
$name = str_replace($omg,"*****",$name);
$name = str_replace($bad,"*****",$name);

$message = str_replace($bad,"*****",$message);
$message = str_replace($bader,"*****",$message);
$message = str_replace($worse,"*****",$message);
$message = str_replace($omg,"*****",$message);
echo $name."<br>".$message;
}
		?>
		<form action="" method="post">
		Name <input type="text" name="name" id="nme" maxlength="20" size="15" value="<?php if(isset($_POST['nme'])){echo $_POST['nme'];}?>" ><br>
		Message
			<p><textarea rows="5" cols="53" name="msg" id="txt"><?php if(isset($_POST['msg'])){echo $_POST['msg'];}?></textarea></p>
			<p class="links"><input type="submit" value="Submit" name="Go!" id="x" >     <input type="reset" value="Reset" name="reset" id="x"></p>
		</form>	

Now as you can tell this is not the most efficient way of doing it, what would you advise?

EDIT: This is only a small part of the code.

[.josh]

how about getting rid of all those foreach loops and using str_ireplace instead?

[DeanWhitehouse]

Ah, yep , i always see it when i am looking at string functions but never use it.

 

Will that sort out the problem of

F*cK?

[.josh]

it is a case insensitive search. It will match

 

Suck

sucK

SucK

SuCk

SUCK

suck

 

but not a literal *'s instead of letters or spaced out letters or special chars that look like the letters, etc..

 

s*ck

su ck

svck

etc...

 

[DeanWhitehouse]

Yeah, i don't think i will need to worry about the other words with spaces etc. If i decide to i will need to write a regex i think.