mysqli connection by default

<?php
//This connection script is mandatory because it is the one used throughout the system
session_start();
	if($_SERVER["REMOTE_ADDR"] == "127.0.0.1" or $_SERVER["REMOTE_ADDR"] == "localhost"){
		$hostname='localhost';
		$username='root';
		$password='xxxxxx';
		$dbname='netalbal_pedralbesbooking';
	}
	else{
		$hostname='localhost';
		$username='netalbal_fsnoya';
		$password='xxxxxx';
		$dbname='netalbal_pedralbesbooking';
	}
$link = mysqli_connect($hostname, $username, $password, $dbname);
mysqli_query($link,"SET CHARACTER SET 'utf8'");
mysqli_query($link,"SET SESSION collation_connection ='utf8_unicode_ci'");
if (!$link) {
	die(mysqli_error());
}
?>