Hello, I'm new to PHP and I not understand what is the meaning of

1. CHMOD folder tmpfiles to 777
2. Execute the .sql file on your database

I have upload the content of public_html to inside my wwwroot folder and when I run my index.php, it say

Fatal error: Call to undefined function mysql_connect() in c:\Inetpub\wwwroot\public_html\config.php on line 44

?

Please give some advices.