How to generate random number?

Using following code we can create random number. Than can be use Order number, unique id or like something that.

<?php 

//Unique or Random number Generate
//$today = date("Ymd");
$today = date("dmY");
$random = strtoupper(substr(uniqid(sha1(time())),0,6));
echo $order_no = $today . $random;

?>

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