<?php
$cek = mysqli_fetch_array(mysqli_query($conn,"SELECT no_surat FROM data_sktm ORDER BY no_surat LIMIT 1"));
$ex = explode('/', $cek['no_surat']);
if (date('d')=='01'){ $a = '01'; }
else{ $a = sprintf("%03d", $ex[0]+1); }
$b = 'SKTM-KUANGBARU';
$c = array('','I','II','III','IV','V','VI','VII','VIII','IX','X','XI','XII');
$d = date('Y');
$no_surat = $a.'/'.$b.'/'.$c[date('n')].'/'.$d;
?>