Establishing a database connection PHP

<?php
$link = mysqli_connect('localhost', 'user', 'password');  //replace user with root of the user name
if (!$link)
{
  $output = 'Unable to connect to the database server.';   // If connection to MySQL server fails
  include 'output.html.php';                              //   error message will be stored $output
  exit();
}

if (!mysqli_set_charset($link, 'utf8'))
{
  $output = 'Unable to set database connection encoding.';
  include 'output.html.php';
  exit();
}

if (!mysqli_select_db($link, 'some-table'))
{
  $output = 'Unable to locate the some-table database.';
  include 'output.html.php';
  exit();
}

$output = 'Database connection established.';
include 'output.html.php';

?>