Forum Conditional Usergroup on Forum Block

[محروم.كوم]

I want to use conditional on forum block.

I've tried this PHP code on the forum block and it works
PHP Code:
$s .= '
Hello World...';
if (is_member_of($vbulletin->userinfo, 1, 2, 3, 4, 8, 13)) {
$s .= '
You are a special member';
}
$s .= '
';

return $s;

But the result is getting cached, altough i have set cache life to "0".
I don't know maybe template editing (with normal conditional tag) is a solution here instead of PHP code on forum block?

I have looked on "block_html" template but i am not sure if i should modify there, because i thought if i modify there, all forum blocks will be affected, not on specific forum block.</div> __DEFINE_LIKE_SHARE__