connection db error mysqli connection

please help me resolve

Warning: mysqli_select_db() expects parameter 1 to be mysqli, string given in C:\xampp\htdocs\trperpus\include\koneksi_db.php on line 10

Warning: mysqli_error() expects exactly 1 parameter, 0 given in C:\xampp\htdocs\trperpus\include\koneksi_db.php on line 10 Gagal mengaktifkan database

<?php
$db_host    = "localhost";
$db_user    = "root";
$db_pass    = "";
$db_name    = "db_perpus";
$konek  = mysqli_connect($db_host,$db_user,$db_pass,$db_name) or die ("Gagal koneksi ke server");
mysqli_select_db($db_name, $konek) or die ("Gagal mengaktifkan database".mysqli_error());
$denda1=200;
?>