changing from mysql to mysqli but it won't connect?

[Tpick]

Hi, sorry for noob question, first time poster. Hopefully I"m in the correct section of the forum. I'm running php version 5.6.40 and have mysqli enabled on my website. I'm trying to to change over from the old mysql_connect to mysqli_connect (and so on) so that I can eventually upgrade to php 7. I'm wondering if there is anything I'm missing or supposed to do, every resource I can find online says that for something this simple I simply need to add the "i" to the end, but for some reason it won't connect once I add the "i". I'll include the code in question. If I simply delete the "i" it works just fine.

 

$host = "localhost:3036";  
$serverusername = "my_username"; 
$serverpassword = "my_password"; 
$db_name = "my_db_name";

$connection = mysqli_connect("$host", "$serverusername", "$serverpassword")or die("cannot connect");
$db = mysqli_select_db("$db_name", $connection)or die("cannot select DB");

 

[benanamen]

22 minutes ago, Tpick said:

every resource I can find online says that for something this simple I simply need to add the "i" to the end

"Every resource" is wrong. Try reading the free manual. This is too simple to just give you the answer.

https://www.php.net/manual/en/mysqli.quickstart.connections.php

https://www.php.net/manual/en/mysqli.select-db.php