如何在獲得評分時將平均值限制在2位小數位？

Question

average rating

這是我的代碼！如何獲得只有2位小數的平均值？

public function getAveRating($restoid){ 
     $where=array(
      "restoid"=>$restoid 
      ); 
     $this->db->where($where); 
     $this->db->select_avg('rate'); 
     $query = $this->db->get('ratings')->first_row('array'); 
     return $query['rate']; 
} 

如何將平均值限制在2位小數獲得評分？

Answer 1

http://php.net/round

public function getAveRating($restoid){ 
     $where=array(
      "restoid"=>$restoid 
      ); 
     $this->db->where($where); 
     $this->db->select_avg('rate'); 
     $query = $this->db->get('ratings')->first_row('array'); 
     return round($query['rate'], 2); 
} 

Answer 2

變化return $query['rate'];到return round($query['rate'],2);