[Lesane]

Use this code (with the part of yours):

PHP Code:

$jointime = (time() - $bbuserinfo[joindate]) / 86400; // amount of days registered
if (5>$jointime AND $bbuserinfo[usergroupid]==X AND $bbuserinfo[posts]<5 AND $foruminfo[forumid]==3)
{
eval("standarderror(\"".gettemplate("error_minposts")."\");");
}