如何使用php生成唯一的自动增量格式化格式的数字

Question

I have a loan application form and it has application No field. it should be readonly. Now i want to generate auto increment formatted number and show inside my text box. application No should be like "LN/SS-DATE-000". can anyone explain, How to generate this number using php and echo in my text box.

Answer 1

If you want to use a unique auto increment number, then you need to store the last generated number somewhere. If you use a database, then the easiest is to store it in a table:

CREATE TABLE `counter` (
  `id` bigint(20) unsigned NOT NULL auto_increment,
  `stub` char(1) NOT NULL default '',
  PRIMARY KEY  (`id`),
  UNIQUE KEY `stub` (`stub`)
) ENGINE=MyISAM

Use the following queries to increase the counter and get the actual value:

REPLACE INTO `counter` (`stub`) VALUES ('a');
SELECT LAST_INSERT_ID();

You can read more about this technique on Flickr's blog .