如何修复PHP中的致命错误？

Question

I found a system that can generate a report I would like to study this system but when I try to generate the system the login was OK but when I put the password and username this error comes out:

Fatal error: Call to undefined function mysql_select_db() in C:\xampp\htdocs\inventory\inventory\db.php on line 8

Can anyone else tell me what is the problem in this system?

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I'm currently using XAMPP V3.2.2

Answer 1

If you are using PHP 7 within your XAMPP then it wont work because that code is too old. mysql_select_db was removed in PHP 7.

http://php.net/manual/en/function.mysql-select-db.php

You will need to install PHP 5 to use that software.

Edit: Pratik Solanki is correct also. The database is being connected using mysqli so depending on the other code in the system you can either change the database connect statement to mysql_connect and use PHP 5 (old mysql connector not recommended) or change all the database statements to use mysqli instead in which case no PHP changes are needed (recommended)