mysqli_select_db() expects parameter 1 to be mysqli, string given

Question

I am getting these errors:

Warning: mysqli_select_db() expects parameter 1 to be mysqli, string given in D:\Hosting\9864230\html\includes\connection.php on line 11

Database selection failed:

<?php
require "constants.php";

// 1. Create a database connection
$connection = mysqli_connect(DB_SERVER,DB_USER,DB_PASS);

// 2. Select a database to use 
$db_select = mysqli_select_db(DB_NAME,$connection);

Answer 1

Your arguments are in the wrong order. The connection comes first according to the docs

<?php
require "constants.php";

// 1. Create a database connection
$connection = mysqli_connect(DB_SERVER,DB_USER,DB_PASS);

// 2. Select a database to use 
$db_select = mysqli_select_db($connection, DB_NAME);