PHP result set to multi select options

PHP Array result set into category wise multi select.

public function FormatEducationOnJobApplicants($Education, $SelectedEducation = '')
{
 $EducationCategory = array();
 $Select = '';
 $OptGroup = '';
 foreach($Education as $Row)
 {
  if(!in_array($Row['EducationCategory'], $EducationCategory))
  {
   if($OptGroup != '')
   {
    $Select .= "";
   }
   array_push($EducationCategory, $Row['EducationCategory']);
   $Select .= "";
   $OptGroup = $Row['EducationCategory'];
  }
  if(is_array($SelectedEducation))
  {
   $Select .= "{$Row['EducationName']}";
  }
  else
  {
   $Select .= "{$Row['EducationName']}";
  }
 }
 if($OptGroup != '')
 {
  $Select .= "";
 }
 return $Select;
}