5 ways to generate unique order numbers in php

This article mainly introduces the method of generating a unique order number in php, which has a certain reference value. Now I share it with you. Friends in need can refer to it

php generates a unique order number 5 methods

The first one

private function doCreateOrderNumber($time){
        　　$i=1;
        　　$dd = date('Ymd',$time);
        　　$aa = 'OH'.$dd;
        　　$res = $this->orderModel->query("select sn from sr_order_list where sn like '$aa%' order by id limit 1");
        　　if(!isset($res[0]['sn'])){
            　　　　$i = 1;
        　　}else{
            　　　　$i = (int)substr($res[0]['sn'],9,10) + 1;
        　　}
        　　while(true){
            　　　　$nsn = 'OH'.$dd.$i;
            　　　　$exist = $this->orderModel->query("select id from sr_order_list where sn = '$nsn' ");
            　　　　if($exist){
                　　　　　　$i++;
            　　　　}else{
                　　　　　　return $nsn;
            　　　　}
        　　}
    }

The second one

$osn = date('Ymd') . str_pad(mt_rand(1, 99999), 5, '0', STR_PAD_LEFT);
echo $osn; //2018070462577

The third one

$osn = date('Ymd').substr(implode(NULL, array_map('ord', str_split(substr(uniqid(), 7, 13), 1))), 0, 8);
echo $osn; //2018070499495653

The fourth one

$order_id_main = date('YmdHis') . rand(10000000,99999999);
  $order_id_len = strlen($order_id_main);
  $order_id_sum = 0;
  for($i=0; $i<$order_id_len; $i++){
  $order_id_sum += (int)(substr($order_id_main,$i,1));
  }
  $osn = $order_id_main . str_pad((100 - $order_id_sum % 100) % 100,2,&#39;0&#39;,STR_PAD_LEFT);
echo $osn; //201807041332258742313727

Fifth Type

$code = array('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J');
$osn = $code[intval(date('Y')) - 2011] . strtoupper(dechex(date('m'))) . date('d') . substr(time(), -5) . substr(microtime(), 2, 5) . sprintf('%02d', rand(0, 99));
echo $osn; //H704764673624352

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