<?php

$mysql_db = 'example_database';
$mysql_host = 'localhost';
$mysql_user = 'example_user';
$mysql_pass = 'Kolosnjaj4321!';

class DatabaseException extends Exception
{
    public function showSpecific()
    {
        return 'Error thrown on line' . $this->getLine() . ' in ' . $this->getFile();
    }
}
class ServerException extends Exception
{
    public function showSpecific()
    {
        return 'Error thrown on line' . $this->getLine() . ' in ' . $this->getFile();
    }
}

try {
    if (!@$con = mysqli_connect($mysql_host, $mysql_user, $mysql_pass)) {
        throw new ServerException();
    } else if (!@mysqli_select_db($con, $mysql_db)) {
        throw new DatabaseException();
    } else {
        echo 'Connected';
    }
} catch (ServerException $ex) {
    echo  $ex->showSpecific();
} catch (DatabaseException $ex) {
    echo $ex->showSpecific();
}