As shown below:

<strong><span style="font-size:18px;">/*編號=年份后兩位+月份+id四位數(shù)*/
  
$id = $this->student_model->save(0, $data);
$sn = date(&#39;Y&#39;, time());
$sn = substr($sn, -2);
$sn.= date(&#39;m&#39;, time());
$sn.=sprintf("%04d", $id);</span></strong>

[Result Preview] Example: 14120001

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