After days working with classes, it may be helpfull having some examples here:

Some parts of the code have been replaced,

 <?php
final class SearhPeopleException extends Exception {}
  class searchPeople
  {
      protected $search, $limit, $clinic_id, $date;
      protected $productName=array(), $clinicProducts = array();
      
      public function __construct($search = array(),$clinic_id=false, $date=false) {
            if(empty($search))throw new SearhPeopleException("The parameter SEACH is required, arrived : $search.");
            $date = ($date) ? $date : date('Y-m-d');
            $this->search = $search;
            $this->clinic_id = $clinic_id;
            $this->date=$date;
            
        }
      
        /*
       * Return Insureds
       */
      public function getInsureds($limit = 50) {
        $this->limit = $limit+1;
          $insureds = array();
          $query = $this->queryInsureds();
          $c = 0; $more = false;
              if(!empty($query)){
            foreach($query as $r){
                   
               }
           }
           return $insureds;
      }

      
      /*
       * Return insureds and build the search
       */
      private function queryInsureds(){
          $search = $this->search;
          $cProducts = $this->clinicProducts;
          
          $query = Doctrine::getTable('Insured')
              ->createQuery('i')
                ->select('i.id, p.name as product_name, p.id as product_id')
                ->leftJoin('i.InsuredProduct ip')
                ->leftJoin('ip.Product p');

            if(!empty($this->clinic_id)){
                $query->whereIn('p.id', $cProducts);
                $query->andWhere('ip.date_end >= '.$this->date);
            }else{
                $query->where('ip.date_end >= '.$this->date);
            }
               
              
    $query->addWhere("$col LIKE ?", "%{$v[1]}%");
    $query->addWhere("$col = ?", "$v[1]");

              
          $result = $query->limit("$this->limit")->execute();
          
          return $result;
          
      }
      
      
      private function personalNumber($n){
        $number = trim($n);
              if($number!='' && strlen($number)>=8){
                  if(strlen($number)==8){
                          $number = strtoupper($number);
                        $number .= substr("TRWAGMYFPDXBNJZSQVHLCKE",strtr($number,"XYZ","012")%23,1);
                  }else{
                      $number = strtoupper($number);
                  }
              }
          return $number;
      }
  }
?>