<?php

$con = mysql_connect("localhost", "root", "") or die ("not connected");
$mydb = mysql_select_db("test_database") or die("not db found");

if($mydb)
{
    echo "database is found";
}
else
{
    echo "error in connecting to database";
}

?>

<?php

$db_host = "localhost";
$db_username = "root";
$db_pass = "test123";
$db_name = "test_database";

@mysql_connect("$db_host", "$db_username", "$db_pass") or die ("Could not connect to MySQL");
@mysql_select_db("$db_name") or die ("No database");

echo"Successful Connection";

?>