PHP code to do this?

[Prince]

Make it so only users logged in see something?

[Dave]

if($vbulletin->userinfo['userid'] <= 0){
// Not logged in
} else {
// Logged in
}

If you want to do it in a template then it depends on the template, but generally something like
<vb:if condition="$bbuserinfo['userid'] <= 0">
Not logged in
<vb:else />
Logged in
</vb:if>

[Prince]

If you want to do it in a template then it depends on the template, but generally something like
<vb:if condition="$bbuserinfo['userid'] <= 0">
Not logged in
<vb:else />
Logged in
</vb:if>

Thank you, worked perfectly!