$brackets = (strpos($string,'[') !== false) and (strpos($string,']') !== false);

if($PowerBB->_GET['page']=='topic'){ 
$hide_sections = array('1','2','3');
$SubjectArr = array();  
$SubjectArr['where'] = array('id',$PowerBB->_GET['id']);  
$SubjectInfov = $PowerBB->subject->GetSubjectInfo($SubjectArr);  
$subject_section =$SubjectInfov['section'];
if(in_array($subject_section,$hide_sections))
{
$PowerBB->_CONF['info_row']['haid_links_for_guest']=1;
}
else
{
$PowerBB->_CONF['info_row']['haid_links_for_guest']=0;
}	   
}