<?php

$db_host="localhost";
$db_username="root";
$db_password="";
$db_name="mydb";

$db_connect=mysqli_connect($db_host, $db_username,$db_password, $db_name);


//check connection
if (mysqli_connect_error())
{
echo "Failed to connect to MySQL:" .mysqli_connect_error();
}
else{
echo "Connection successful" ; }

?>

<?php
error_reporting(1);
$connect_error = 'Sorry, we're experiencing connection problems.';
mysql_connect('localhost','root','') or die($connect_error);
mysql_select_db('mydb') or die($connect_error);
?>