Help php MySql link

Hi guys, what I need is how to make the link between the php and the Database. Is this the code for it? ro something like that? Help me guys... If you could tell me what each command line do I'd appreciate it, cause I got almost all from a friend, but is incomplete. The code follows this message. $db = ("localhost","databasename","databasepassword"); mysql_select_db("your name?",$db); $result = mysql_query("select column1, column2 from domain", $db); echo "column 1 - column 2";