Php Small Enterprise Inventory Management System Design and Implementation Code _ php instance

I have developed a small enterprise inventory management system using PHP & amp; mysql combination. Php was also self-developed for the first time for a slightly larger development.

I have developed a small enterprise inventory management system using a combination of PHP and mysql. Php is also self-developed for the first time. I would like to share it with you here

Check_login Module

The Code is as follows:

Session_start ();
$ Workid = $ _ GET ['wid']; // GET the work ID
If ($ workid! = $ _ SESSION ['$ workid'] | $ workid = ''){
Echo"