/**
  * Creates education filter part
  *
  * @param array $_filter The filter array
  * @param array|string $education The education(s)
  */
 public function createEducationFilter(&$_filter, $education)
 {
     if ($education !== null) {
         if (is_array($education)) {
             foreach ($education as $value) {
                 $this->createEducationFilter($_filter, $value);
             }
         }
         if (is_string($education)) {
             $educationCode = $this->enumeration->getEducationCode($education);
             if ($educationCode != false) {
                 $_filter['featuresFilter']['detailFilter']['educationLevels'][] = array('__type__' => 'EducationLevel', 'code' => $educationCode);
             } else {
                 $this->failed = true;
             }
         }
     }
 }