How to generate unique order numbers in php

How to generate unique order numbers in php: First, you can generate the order number in advance; then delete and save it; when you finally use it, just take one out and use it. The code is [$orderNo = date('YmdHis' ).substr(microtime(), 2, 5)].

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How to generate unique order numbers in php:

function genRequestSn($unique=0){
        $orderNo = date('YmdHis').substr(microtime(), 2, 5) . mt_rand(10000,99999);
        return $orderNo;
    }

function genRequestSn($unique=0){
        $orderNo = date('YmdHis').substr(microtime(), 2, 5) . mt_rand(10000,99999);
        if(!empty($unique)) $orderNo = $orderNo.$unique;
        return $orderNo;
    }

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