Use of strip_tags and impact of allowed tags on malicious code

[jwhite68]

If I use the PHP function strip_tags to strip everything except for bullet points and breaks - effectively:

 

$output= strip_tags($desc,'<br><li><ul>');

 

As I echo $output on my form, is there any potential here for malicious code to still creep through?

In this case, $desc is HTML data from an external file, which could contain malicious code within it.

[jwhite68]

Can a moderator please move this to the PHP Help forum, as I couldnt find a way to do this myself.  I accidentally posted under HTML Help. Thanks.