kl pake ci.. cuma logika aja

<?php
//==========step 1 dapatkan jumlah data yang memiliki tgl yg sama
$date=date("Y-m-d");
$sql="select count(id) c from table where date like '$date%'";
$r=$this->db->query($sql)->row_array();
$nData=$r['c'] + 1;
//===buat code .. asumsikan nData=2
$code=date("ymd").sprintf("%03s",$nData); //140127002