PHP Database Connect

databaseConnect.php

<?php

    $conn = mysqli_connect("localhost","root","");
    if(!$conn){
        die("Host connection failed.<br/>");
    }else{
        echo "Host connected.<br/>";
    }
   
    $create_db = "CREATE DATABASE authentication";
    $create_db_result = mysqli_query($conn,$create_db);
    if(!$create_db_result){
        echo "Couldn't create database.<br/>";
    }else{
        echo "Database created.<br/>";
    }

    $connect_db = mysqli_select_db($conn,'authentication');
    if(!$connect_db){
        echo "Couldn't create database connection.<br/>";
    }else{
        echo "Database connection created.<br/>";
    }

    

    $create_table_query = "CREATE TABLE users (id INT(2) AUTO_INCREMENT PRIMARY KEY, username VARCHAR(32) NOT NULL, pwd VARCHAR(32) NOT NULL)";
    $create_table = mysqli_query($conn,$create_table_query);
    if(!$create_table){
        echo "Couldn't create table.<br/>";
    }else{
        echo "Table created successfully.<br/>";
    }

    $add_record_query = "INSERT INTO `authentication`.`users`(`id`,`username`,`pwd`)VALUES('10','arjun','adhikari')";
    $add_record = mysqli_query($conn,$add_record_query);
    if(!$add_record){
        echo "Couldn't update record.<br/>";
    }else{
        echo "Record updated successfully.<br/>";
    }

?>