PHP generates a unique order number, PHP generates order number _php tutorial

PHP generates a unique order number, PHP generates the order number

Found on the Internet, find this classmate's idea is very good, Redtamo, concrete please steady past to see, I make a brief overview, the method used on the English alphabet, month and day, Unix timestamp and microsecond number, random number, the likelihood of repetition greatly reduced, or very good. The use of letters is representative, a letter corresponding to a year, a total of 16, not many and many.

1.

Copy the Code code as follows: <?php
$yCode = Array (' A ', ' B ', ' C ', ' D ', ' E ', ' F ', ' G ', ' H ', ' I ', ' J ');
$orderSn = $yCode [Intval (Date (' Y '))-2011]. Strtoupper (Dechex (the date (' M '))). Date (' d '). SUBSTR (Time (),-5). SUBSTR (Microtime ()] 2, 5). sprintf ('%02d ', rand (0, 99));
?>

Build Effect:

A422694333616096

2.

Copy the Code code as follows: <?php
function Build_order_no () {
Return date (' Ymd '). substr (Implode (NULL, Array_map (' Ord ', Str_split (substr (), 7, 13), 1)), 0, 8);
}
Echo Build_order_no ();
?>

Output Result:

20140623561004852014062349535399

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