Help with Conditional in plugin

I have a field that I want to hide from guests (search engines) on my postbit. My plugin puts the field in place in the postbit, but I cannot get the conditional correct to display it only to members of the site. Can someone offer advice?

Here is what I have so far:

Code:

if (!empty($post["field{$this->registry->options['grow_comp_profile_field']}"]))
{
    $template_hook['postbit_my_comp'] .= '<dt>' . $vbphrase['grow_comp'] . '</dt>  <dd>' . $post["field{$this->registry->options['grow_comp_profile_field']}"] . '</dd>';
}

I want this field answer to display only to members of the site. I know the template conditional would be:

Code:

<vb:if condition="$show['member']">xxx</vb:if>

But this will not work in php. Any help would be appreciated!

Also, if anyone has a list of conditionals that work in php for vb4, that would be great too.

Thanks,
Bruce

Code:

if(is_member_of($userinfo, 1, 2, 3, 4, 6, 7)) {
echo "this user is in 1/2/3/4/6/7 usergroup"; }
else {
echo "this user is not in 1/2/3/4/6/7 usergroup";
}

depending on what script you are hooking to, you may need to use $bbuserinfo instead of $userinfo

Thank you, Brian! I appreciate the help. I will give it a go with this.

Bruce