i believe you already have a database which contains customer id, password, and the name of their individual web page. you need to specify the mysql server name, user name and password in order to connect to the database.
the script starts with a html form. user enters the id and password in the form and click submit. the script will post the values to the same page. after user clicks submit, the script will retrieve the values and connect to database. you may need to modify the sql query according to your table. if user id and password match with the record in the database, script will redirect user to their individual page.
I think I should write more comments
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