用php转换成数字

Question

我用md5做了一个随机码，但是如何让码只包含数字

  $this->db->select('RIGHT(service.tracking_number,4) as kode', FALSE);
  $this->db->order_by('id_service','DESC');    
  $this->db->limit(1);    
    $query = $this->db->get('service');         
      if($query->num_rows() <> 0){         
       $data = $query->row();      
       $kode = intval($data->kode) + 1;    
      }else {           
       $kode = 1;    
      }
  $kodemax = str_pad($kode, 1, "0", STR_PAD_LEFT); 
  $kodejadi = "RJC".md5($kodemax);    
  $hasil = substr($kodejadi, 0,-15);
  return $hasil;  

  output RJC1679091c5a880faf6

如何制作这些输出数字？

Answer 1

要生成随机数，您可以使用这个 sn-p：

$count = 10;
$key = '';
$chars = '0123456789';
for($x = 0; $x < $count; $x++) {
  $key = $key.$chars[rand(0, strlen($chars) - 1)];
}

echo $key;